| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Orders of knighthood and chivalry | No definition provided | Christopher Rauch | 2023.12.01 |
| Orders of knighthood and chivalry--Insignia | No definition provided | Christopher Rauch | 2023.12.01 |
| Orders, Preparation of (Military science) | No definition provided | Christopher Rauch | 2023.12.01 |
| ordinal relation | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ordinal scale | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ordinance of 1787 | No definition provided | Christopher Rauch | 2023.12.01 |
| ordinary least squares | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ordination | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordnance | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordnance, Coast | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordnance--Manufacture | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordnance, Naval | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordnance, Rapid-fire | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordnance testing | No definition provided | Christopher Rauch | 2023.12.01 |
| Ordonezite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ordovician | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ordovician | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ordovician formation | No definition provided | Christopher Rauch | 2023.12.01 |
| ore | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Orebroite-III | No definition provided | Ryan McGranaghan | 2023.04.16 |