| Acronym | Sense | Language | Topics |
|---|---|---|---|
| ER | Endosplasmic Reticulum | In English | |
| ER | Established Reliability | In English | |
| ER | Explanation Report | In English | |
| ER | Extended Reliability | In English | |
| ER | Europe Résistance | In French | → Political parties and movements |
| ER | Entity Resolution | In English | → Writing systems → Data |
| ER | Électrification Rurale | In French | → Electrical engineering |
| ER | Est Républicain (www.estrepublicain.fr) | In French | → Newspapers, journalism → France |
| ER | Emergency Room | In English | → Traumatology |