| 1 | Middle French | prosaïque | — |
| 2 | Medieval Latin | prosaicus | in prose |
| 3 | Latin | prōsa | — |
| 4 | Latin | prorsus | straightforward, right onwards, straight, direct;... |
| 5 | Latin | prō | — |
| 6 | Latin | ratus | considered, having been considered; established,... |
| 7 | Latin | rēōr | — |
| 8 | Proto-Italic | rēōr | to reckon, to calculate; to think, to deem, to... |
| 9 | Proto-Indo-European | h₂reh₁- | to think, reason; to arrange |
| 10 | Proto-Indo-European | h₂er- | to fit, to fix, to put together |