| Acronym | Sense | Language | Topics |
|---|---|---|---|
| RA | Recognition Arrangement | In English | |
| RA | Revue d'Assyriologie et d'archéologie orientale | In French | → Serial publications, periodicals → Archeology → History |
| RA | Rheumatoide Arthritis | In German | → Pathology |
| RA | Religious of Assumption | In English | → Roman catholic church |
| RA | Radar Altimeter | In English | |
| RA | Range Area | In English | |
| RA | Right Aft | In English | |
| RA | Right Ascension | In English | |
| RA | Ricerche Astronomiche | In Italian | → Serial publications, periodicals → Astronomy |
| RA | Regular Army | In English | → Military affairs |
| RA | Renseignement Annexe | In French | |
| RA | Réflexion Analytique | In French | |
| RA | Rubrique d'Activité | In French | |
| RA | Resettlement Administration | In English | → Central administration → Migrations |
| RA | Régiment d'Artillerie | In French | → Military affairs |