

| Acronym | Sense | Language | Topics | 
|---|---|---|---|
| SEAL | Safety Evidence Assurance Level | In English | → Accidents, risks, safety | 
| SEAL | Sea Scout Advanced Leadership | In English | → Organizations and associations | 
| SEAL | Software Engineering and Ada Lab(oratory) | In English | → Research institutes → Software | 
| SEAM | Southeast Asia Microform Project | In English | → Libraries → Area studies | 
| SEAM | System Engineering and Analysis Management | In English | → Management → Engineering, technology | 
| SEAMEO | Southeast Asian Ministers of Education Organization | In English | → International relations → Central administration → Education | 
| SEAP | Southeast Asia Program | In English | → Higher education, universities → Area studies | 
| SEAP | Southeast Asia Publications | In English | → Serial publications, periodicals → Area studies | 
| SEAPG | Support Equipment Acquisition Planning Group | In English | → Maintenance and logistics | 
| SEAR | South East Asia Research | In English | → Serial publications, periodicals → Area studies | 
| SEARC | Southeast Asia Research Centre City | In English | |
| SEARO | South-East Asia Regional Office | In English | |
| SEARP | South-East Asia Rainforest Research Programme | In English | → Ecology | 
| SEAS | School of East Asian Studies | In English | → Higher education, universities → Area studies | 
| SEAS | School of Engineering and Applied Sciences | In English | → Specialized or polytechnical colleges → Engineering, technology | 
| SEASIM | System Element Attrition Simulation | In English | |
| SEASREP | Southeast Asian Studies Regional Exchange Programme | In English | → Education → Area studies | 
| SEASSI | Southeast Asian Studies Summer Institute | In English | → Area studies | 
| SEATO | Southeast Asia Treaty Organization | In English | → Organizations and associations → International relations | 
| SEATO | South-East Asia Treaty Organization | In English | → Organizations and associations → International relations | 
| SEB | Scientific Equipment Bay | In English | |
| SEB | Source Evaluation Board | In English | |
| SEB | Support Equipment Building | In English | |
| SEB | Systems Engineering Branch | In English | → Engineering, technology | 
| SEB | Société d'Embouteillage de Bourgogne | In French | → Beverage industry | 
| SEBC | Système Européen de Banques Centrales = ESCB | Europski sistem centralnih banaka | In Bosnian = SEBC | Sistema Europeu de Bancs Centrals | In Catalan = ESCB | Det Europæiske System af Centralbanker | In Danish = ESZB | Europäisches System der Zentralbanken | In German = ΕΣΚΤ | Ευρωπαϊκό Σύστημα Κεντρικών Τραπεζών | In Greek = ESCB | European System of Central Banks | In English = ESCB | Eŭropa Sistemo de Centraj Bankoj | In Esperanto = SEBC | Sistema Europeo de Bancos Centrales | In Spanish = EKPS | Euroopa Keskpankade Süsteemi | In Estonian = KBER | Központi Bankok Európai Rendszere | In Hungarian = SEBC | Sistema Europeo delle Banche Centrali | In Italian = ESCB | Europees Stelsel van Centrale Banken | In Dutch = ESSB | Det europeiske systemet av sentralbanker | In Norwegian = ESBC | Europejski System Banków Centralnych | In Polish = SEBC | Sistema Europeu de Bancos Centrais | In Portuguese = ЄСЦБ | Європейська система центральних банків | In Ukrainian = ESCB | Európsky systém centrálnych bánk | In Slovak = ECBS | Europeiska centralbankssystemet | In Swedish | In French | → Banks → European Union | 
| SEBC | Sistema Europeu de Bancs Centrals = ESCB, ESZB, ΕΣΚΤ, EKPS, KBER, ESSB, ESBC, ЄСЦБ, ECBS (look above) | In Catalan | → Banks → European Union | 
| SEBC | Sistema Europeo de Bancos Centrales = ESCB, ESZB, ΕΣΚΤ, EKPS, KBER, ESSB, ESBC, ЄСЦБ, ECBS (look above) | In Spanish | → Banks → European Union | 
| SEBC | Sistema Europeo delle Banche Centrali = ESCB, ESZB, ΕΣΚΤ, EKPS, KBER, ESSB, ESBC, ЄСЦБ, ECBS (look above) | In Italian | → Banks → European Union | 
| SEBC | Sistema Europeu de Bancos Centrais = ESCB, ESZB, ΕΣΚΤ, EKPS, KBER, ESSB, ESBC, ЄСЦБ, ECBS (look above) | In Portuguese | → Banks → European Union | 
| SEBIS | Semantics in Business Information Systems | In English | → Knowledge management → Semiotics | 
| SEBIS | Senioren- und Behinderten Informationsservice | In German | |
| SEC | Securities and Exchange Commission | In English | → Telecommunications | 
| SEC | Sigma Energy Consulting | In English | → Energy economics → Consulting | 
| SEC | Sequential Events Controller | In English | |
| SEC | Source Evaluation Committee | In English | |
| SEC | Split Expander Cycle | In English | |
| SEC | Soest ESVAC Combinatie | In Dutch | → Organizations and associations → Sport, physical exercises | 
| SECAAS | Southeast Conference of the Association for Asian Studies | In English | → Associations → Area studies | 
| SÉCAM | Séquentiel Couleur à Mémoire | In French | → Telecommunications | 
| SECB | Scientific Engineering Centre Biomass | In English | |
| SECED | Servicio Central de Documentación | In Spanish | → Central administration → Spain | 
| SECI | South East European Co-operative Initiative | In English | → International relations | 
| SECIS | SElenoCysteine Insertion Sequence | In English | → Genetics → Biochemistry, biophysics | 
| SeCIU | Servicio Central de Informática Universitario | In Spanish | → Computer science → Higher education, universities | 
| SECM | Science and Engineering of Composite Materials | In English | → Serial publications, periodicals → Materials science | 
| SECMCA | Secretaría Ejecutiva del Consejo Monetario Centroamericano (www.secmca.org) | In Spanish | → International economic cooperation | 
| SECO | Sustainer Engine Cutoff | In English | → Vehicle engineering | 
| SECO | State Secretariat for Economic Affairs | In English | → Economics → Central administration → 33972 | 
| SECO | Sveriges Elevråds Centralorganisation | In Swedish | → Organizations and associations → Sweden | 
| SECOQC | Secure Communication based on Quantum Cryptography | In English | → Telecommunications → Quantum mechanics | 
| SECOR | Sequential Collation Or Range | In English | |
| SECS | Sequential Events Control System | In English | |
| SECS | Shuttle Events Control Subsystem | In English | → Astronautics | 
| SECS | Simulation/Experiment Control System | In English | |
| SECTM | Société d'Électricité et de Thermique du Centre et du Midi | In French | → Electrical engineering → Energy economics | 
| SED | Space Engineering Document | In English | → Astronautics | 
| SED | Schweizerischer Erdbebendienst (www.seismo.ethz.ch) | In German | → Organizations and associations → Seismology, earthquakes → Switzerland | 
| SED | Surface-conduction Electron-emitting Display | In English | → Electronics | 
| SEDEE | Service d'Enlèvement et de Destruction des Engins Explosifs | In French | → Military affairs → Military engineering | 
| SedG | Sedimentary Geology (www.elsevier.com/locate/sedgeo) | In English | → Serial publications, periodicals → Earth sciences | 
| SEDIC | Sociedad Española de Documentación e Información Científica | In Spanish | → Organizations and associations → Documentation → Libraries → Spain | 
| Sedim | Sedimentology | In English | → Serial publications, periodicals → Earth sciences | 
| SEDPA | Syndicat des Entreprises de Distribution de Programmes Audiovisuels | In French | → Organizations and associations → Cinema, movies → Telecommunications | 
| SEDR | Systems Engineering Department Report | In English | → Engineering, technology | 
| SEE | Secondary Electron Emission | In English | |
| SEE | Service de l'Énergie de l'État | In French | → Central administration → Energy economics | 
| SEE | Software Engineering Exercise | In English | → Software | 
| SEE | Software Equality Evaluation | In English | → Software | 
| SEE | Spazio Economico Europeo = EEA | European Economic Area | In English = EEE | Espace Économique Européen | In French = EWR | Europäischer Wirtschaftsraum | In German = ЕИЗ | Европейска икономическа зона | In Bulgarian = EHP | Evropský hospodářský prostor | In Czech = EØS | Europæisk Økonomisk Samarbejdsområde | In Danish = EEA | Eŭropa Ekonomia Areo | In Esperanto = ΕΟΖ | Ευρωπαϊκή Οικονομική Ζώνη | In Greek = EES | Evrópska efnahagssvæðið | In Icelandic = EES | Europeiska Ekonomiska Samarbetsområdet | In Swedish = EWR | Europäesche Wirtschaftsraum | In Letzeburgesh = EGT | Európai Gazdasági Térség | In Hungarian = EER | Europese Economische Ruimte | In Dutch = EEA | 欧州経済領域 | In Japanese = EØS | Det europeiske økonomiske samarbeidsområde | In Norwegian = EØS | Det Europeiske Økonomiske Samarbeidsområdet | In Nynorsk = EOG | Europejski Obszar Gospodarczy | In Polish = EEE | Espaço Económico Europeu | In Portuguese = ЕЭЗ | Европейская экономическая зона | In Russian = EHP | Európsky hospodársky priestor | In Slovak = ЕЕП | Европски економски простор | In Serbian = ETA | Euroopan talousalue | In Finnish | In Italian | → Economics → European Union | 
| SEE | Société des Électriciens et des Électroniciens (www.see.asso.fr) | In French | → Associations → Electrical engineering → Electronics → France | 
| SEE-ECN | South East Europe Education Cooperation Network | In English | |
| SEEA | Serbian Energy Efficiency Agency | In English | → Energy economics | 
| SEEC | Scottish Energy and Environment Conference | In English | → Organizations and associations → Environmental protection → Energy economics → United Kingdom | 
| SEECP | South East Europe Co-operation Process | In English | → International relations | 
| SEECR | Southeastern Early China Roundtable | In English | → History → China | 
| SEEDS | Subarctic ocean Enrichment and Ecosystem Dynamics Study | In English | → Ecology → Marine research, oceanography | 
| SEEJ | Society of Environmental Engineers Journal | In English | → Serial publications, periodicals → Threats to the environment → Environmental technology, water supply, waste management | 
| SEEMO | South East Europe Media Organisation | In English | → Newspapers, journalism | 
| SEER | Scholars Engaged in Electronic Resources | In English | → Libraries | 
| SEER | Sensor Experimental Evaluation and Review | In English | |
| SEERC | South East European Research Centre | In English | → Research institutes | 
| SEF | Svenska Esperanto Förbundet (www.esperanto.se) | In Swedish | → Organizations and associations → Artificial languages (linguistics) → Sweden | 
| SEF | Section Économique et Financière | In French | → Police → Economics → Finance | 
| SEF | Space Environmental Facility | In English | → Astronomy → Astronautics | 
| SEF | Sveda Esperanto-Federacio | In Esperanto | → Organizations and associations → Artificial languages (linguistics) | 
| SEF | Singapore Epilepsy Foundation (www.epilepsy.com.sg) | In English | → Foundations → Neurology | 
| SEFA | Service d'Exploitation de la Formation Aéronautique | In French | → Specialized or polytechnical colleges → Aeronautics, aircraft | 
| SEFTI | Specialized Fund for Therapeutic Innovation | In French | → Finance | 
| SEG | Société Française de Gynécologie | In French | → Organizations and associations → Gynaecology → France | 
| SEG | Society of Economic Geologists | In English | → Organizations and associations → Economic geology | 
| SEG | Simulation Engineering Group | In English | → Computer simulation → Engineering, technology | 
| SEG | System Engineering Ground Rule | In English | |
| SEG | Supplementum Epigraphicum Graecum | In Latin | → Archeology | 
| SEGeo | Seismology and Exploration Geophysics | In English | → Serial publications, periodicals → Geophysics → Seismology, earthquakes | 
| SEGPA | Section d'Enseignement Général et Professionnel Adapté | In French | → Education | 
| SEGUR | (Intégration de la) Sécurité routière dans la Gestion Urbaine | In French | → Transport and postal services → Regional planning | 
| SEH | Sportclub Excelsior Heerde | In Dutch | → Organizations and associations → Sport, physical exercises | 
| SEHK | Stock Exchange Hong Kong | In English | → Financial markets | 
| SEI | Space Exploration Initiative | In English | |
| SEI | Sistemul Educaţional Informatizat | In Romanian | → Education | 
| SEI | Software Engineering Institute | In English | → Software | 
| SEI | Seller End Item | In English | |
| SEI | Support Equipment Installation | In English | → Maintenance and logistics | 
| SEICO | Support Equipment Installation and Checkout | In English | → Maintenance and logistics | 
| SEIF | Siondróm Easpa Imdhíonachta Faighte = AIDS | Acquired Immune Deficiency Syndrome | In English = SIDA | Syndrome d'Immuno-Déficience Acquise | In French = VIGS | Verworwe Immuniteitsgebreksindroom | In Afrikaans = SIDA | Síndrome de Inmuno-Deficiencia Adquirida | In Occitan = SIDA | Sindromo di Imuno-Defekteso Aquirita | In Ido = AIDS | Akirita Imuno-Deficita Simptomaro | In Esperanto = SIDA | Sindrome d'inmunodefizienzia aquirita | In Aragonese = СПИН | Синдром на придобитата имунна недостатъчност | In Bulgarian = QİÇS | Qazanılmış İmmun Çatışmazlığı Sindromu | In Azerbaijani = SIDA | Síndrome d'Immunodeficiència Adquirida | In Catalan = HIES | Hartutako Immuno Eskasiaren Sindromea | In Basque = SIDA | Síndrome de Inmunodeficiencia Adquirida | In Spanish = AIDS | Annlochd Inneamh Dìon-Slàinte | In Scottish Gaelic = ՁԻԱՀ | Ձեռքբերովի Իմունային Անբավարվածության Համախտանիշ | In Armenian = SCDI | Syndromis Comparatis Defectu Immunitatis | In Latin = 에이즈 | 후천성 면역 결핍 증후군 | In Korean = შიდსი | შეძენილი იმუნური დეფიციტის სინდრომი | In Georgian = СИДА | Синдромот на стекнат имунолошки дефицит | In Macedonian = СИДА | синдром стеченог имунолошког дефицита | In Serbian = AIDS | Akvirírani imúnski deficítni sindróm | In Slovenian = СПИД | Синдром приобретённого иммунного дефицита | In Russian = SIDA | Sindromul Imunodeficienţei Autodobândite | In Romanian = UHCW | Unquy hark'aypa chaskisqa waqlliynin | In Quechua = SIDA | Síndrome da imunodeficiência adquirida | In Portuguese = AIDS | Hội chứng Suy giảm Miễn dịch Mắc phải | In Vietnamese = СНІД | Cиндром набутого імунодефіциту | In Ukrainian = AIDS | Alınğan İmmun Defisit Síndromı | In Tatar = UKIMWI | Upungufu wa Kinga Mwilini | In Swahili | In Irish | → Immunology and allergy → Infectious diseases | 
| SEIMAT | Syndicat des Entreprises Internationnales de Matériels de Travaux Publics, Mines et Carrières, Bâtiment et Levage, Manutention (www.seimat.com) | In French | → Organizations and associations → Mining → Civil engineering → Construction | 
| SEIN | Stichting Epilepsie Instellingen Nederland (www.sein.nl) | In Dutch | → Foundations → Medicine → Netherlands | 
| SEINIT | Security Expert INITiative | In English | |
| SEINO | Salons de l'Économie et de l'Industrie du Nord-Ouest | In French | → Economics → Industry, industrial policy → France | 
| SEIS | Shuttle Experiments Integration Support | In English | → Astronautics | 
| SEIS | Spacelab Experiments Integration Support | In English | → Astronautics | 
| SEIS | Standard End Item Specification | In English | |
| SEIST | System Engineering, Integration, and Support Team | In English | → Engineering, technology | 
| SEIT | System Engineering, Integration, and Test | In English | → Engineering, technology | 
| SEITA | Société d'Exploitation Industrielle des Tabacs et des Allumettes | In French | → 6639 → France | 
| SEJU | Svedia Esperantista Junulara Unuiĝo | In Esperanto | → Organizations and associations → Artificial languages (linguistics) | 
| SEK | Svenska Elektriska Kommissionen | In Swedish | → Electrical engineering → Sweden | 
| SEK | Seula Esperanto-Kulturcentro | In Esperanto | → Civilization, culture, progress → Artificial languages (linguistics) | 
| SEK | Sorocaba Esperanto-Klubo | In Esperanto | → Organizations and associations → Artificial languages (linguistics) | 
| SEKT | Semantic Knowledge Technologies | In English | → Computer-based techniques → Semiotics | 
| SEL | Skolta Esperanto-Ligo | In Esperanto | → Organizations and associations → Artificial languages (linguistics) | 
| SEL | Système d'Échange Local | In French | → Economics | 
| SEL | Société d'Exercice Libéral | In French | → 334 | 
| SEL | Systems Electronics Laboratory | In English | → Research institutes → Electronics | 
| SEL | Systems Engineering Laboratories | In English | → Research institutes → Engineering, technology | 
| SELF | Société d'Ergonomie en Langue Française (www.ergonomie-self.org) | In French | → Organizations and associations → Human-computer interaction | 
| SELL | Syndicat des Éditeurs de Logiciel de Loisirs (https://www.sell.fr/) | In French | → Organizations and associations → Software → Leisure → Entertainment → France | 
| SELL | Suomen Eläinlääkäriliitto Finlands Veterinärförbund (www.sell.fi) | In Finnish | → Organizations and associations → Veterinary medicine → Finland | 
| SEM | SEmantic Memory | In English | → Software → Semiotics | 
| SEM | Space Environment Monitor | In English | |
| SEM | Service d'Économie Maritime | In French | → Economics → Marine research, oceanography → Fishing, hunting | 
| SEM | Société d'Économie Mixte | In French | → Economics → Public administration, government | 
| SEM | Scanning Electron Microscope | In English | |
| SEM | Seller's Engineering Memo | In English | |
| SEM | Shuttle Experiment Module | In English | → Astronautics | 
| SEM | Space Environment Monitoring | In English | → Astronomy → Astronautics | 
| SEM | Subcontractor Engineering Memorandum | In English | → Contract law | 
| SEM | System Engineering Management | In English | → Engineering, technology | 
| SEMA | Specialty Equipment Market Association (www.sema.org) | In English | → Associations → Automobile manufacturing | 
| SEMA | Search Engine Marketing Association | In French | → Associations → Internet → 659 | 
| SEMA | Speed Equipment Manufacturers Association | In English | → Associations | 
| SEMIDE | Système Euro-Méditerranéen d'Information sur les savoir-faire dans le Domaine de l'Eau | In French | → Knowledge management → Hydrology → 627 → Environmental technology, water supply, waste management | 
| SEMKO | Svenska Elektriska Materielkontrollanstalten | In Swedish | → Electrical engineering → Sweden | 
| SEMO | Strijd En Moed Overwint | In Dutch | → Organizations and associations → Sport, physical exercises | 
| SEMP | System Engineering Management Plan | In English | → Engineering, technology | 
| SEMPO | Search Engine Marketing Professional Organization | In English | → Organizations and associations → Internet | 
| SEMS | Space Environment Monitor System | In English | → Astronautics | 
| SEMWS | Survivable, Endurable Missile Warning System | In English | → Military affairs → Military engineering | 
| SEN | Sistemul Electroenergetic Naţional | In Romanian | → Energy economics | 
| SEN | Scénario d'Évolution Normale | In French | |
| SENA | Société d’Énergie Nucléaire des Ardennes | In French | → Organizations and associations → Nuclear technology | 
| SENACYT | Secretaría Nacional de Ciencia y Tecnología | In Spanish | → Public administration, government → Mathematics and natural sciences → Applied sciences, technology | 
| SENAI | Serviço Nacional de Aprendizagem Industrial | In Portuguese | → Engineering, technology | 
| SenAR | Sendai Astronomiaj Raportoj | In Esperanto | → Serial publications, periodicals → Astronomy | 
| SENAS | Southern Europe Network of Asian Studies | In English | → Organizations and associations → Area studies | 
| SEND | Shared Equipment Need Date | In English | |
| SENE | Système Électrique Nord-Est | In French | → Electrical engineering | 
| SENSE | Security-enhanced Near Field Communication Systems | In English | → Telecommunications | 
| SEO | Search Engine Optimization | In English | → Internet → 659 | 
| SEO | Special Engineering Order | In English | → Engineering, technology | 
| SEOLTO | Samenspel En Oefening Leidt Tot Overwinning | In Dutch | → Organizations and associations → Sport, physical exercises | 
| SEOS | Synchronous Earth Observation Satellite | In English | → Astronomy → Astronautics | 
| SEP | Société Européenne de Propulsion | In French | → Vehicle engineering | 
| SEP | Sclérose en plaques | In French | → Pathology | 
| SEP | Shuttle Electronics Package | In English | → Electronics → Astronautics | 
| SEP | Solar Electric Propulsion | In English | → Energy economics → Electrical engineering | 
| SEP | Space Electronics Package | In English | → Electronics → Astronautics | 
| SEP | Standard Electronic Package | In English | → Electronics | 
| SEP | Support Equipment Package | In English | |
| SEP | Systems Engineering Plan | In English | → Engineering, technology | 
| SEP | Sport En Plezier | In Dutch | → Organizations and associations → Sport, physical exercises | 
| SEP-PP | Sclérose en Plaques Progressive Primaire | In French | → Immunology and allergy → Neurology | 
| SEP-PR | Sclérose en Plaques Récurrente-Progressive | In French | → Immunology and allergy → Neurology | 
| SEP-RR | Sclérose en Plaques Récurrente-Rémittente | In French | → Immunology and allergy → Neurology | 
| SEP-SP | Sclérose en Plaques Progressive Secondaire | In French | → Immunology and allergy → Neurology | 
| SEPA | Site Engineering Project Authorization | In English | |
| SEPAC | Space Experiments with Particle Accelerators | In English | |
| SEPAC | Service Électrique du Pacifique | In French | → 3213 | 
| SEPAP | Shuttle Electrical Power Analysis Program | In English | → Electrical engineering → Astronautics | 
| SEPAR | Shuttle Electrical Power Analysis Report | In English | → Electrical engineering → Astronautics | 
| SEPEX | Sociedad Española de Psicología Experimental (www.sepex.es) | In Spanish | → Organizations and associations → Psychology → Spain | 
| SEPLN | Sociedad Española para el Procesamiento del Lenguaje Natural (www.sepln.org) | In Spanish | → Organizations and associations → Computer-based techniques → Linguistics | 
| SEPP | System Effectiveness Program Plan | In English | |
| SEPPE | Soutien à l'Élaboration et au Portage de Projets Européens | In French | → Research policy | 
| SEPRO | Société d'Exploitation des Plateformes de Recrutement et d'Orientation | In French | → Labour, labour economics → Education | 
| SEPS | Solar Electric Propulsion System | In English | → Electrical engineering → Astronautics | 
| SEPTEN | Service Études et Projets Thermiques Et Nucléaires | In French | → Energy economics → Nuclear technology | 
| SEQUEL | Structured English Query Language | In English | → Data | 
| SER | Sources d'Énergie Renouvelable | In French | → Energy economics | 
| SER | Service Employment Redevelopment | In English | → Labour, labour economics | 
| SER | System Engineering Review | In English | → Engineering, technology | 
| SER | Sociedad Española de Radiodifusión | In Spanish | → Organizations and associations → Telecommunications → Spain | 
| SER | Sociaal-Economische Raad (www.ser.nl) | In Dutch | → Organizations and associations → Social sciences → Economics → Netherlands | 
| SERA | Société d'Étude et Réalisation Automobile | In French | → Automobile manufacturing | 
| SERAA | Système Électrique Rhône-Alpes Auvergne | In French | → Electrical engineering | 
| SerAJ | Serbian Astronomical Journal | In English | → Serial publications, periodicals → Astronomy | 
| SERAM | Société d'Études et de Recherches de l'École Nationale Supérieure d'Arts et Métiers | In French | → Research policy → Specialized or polytechnical colleges → Engineering, technology | 
| SERAPHIS | Société d'Etudes et de Recherches Philosophiques et HIStoriques | In French | → Organizations and associations → Philosophy, psychology → History | 
| SERB | Shuttle Engineering Review Board | In English | → Astronautics |