| 1 | English | promise | an oath or affirmation; a vow; a transaction... |
| 2 | Middle English | promis | — |
| 3 | Old French | promesse | promise |
| 4 | Medieval Latin | promissa | — |
| 5 | Latin | prōmissum | — |
| 6 | Latin | promissus | promised |
| 7 | Latin | prōmittō | — |
| 8 | Latin | prō | — |
| 9 | Latin | ratus | considered, having been considered; established,... |
| 10 | Latin | rēōr | — |
| 11 | Proto-Italic | rēōr | to reckon, to calculate; to think, to deem, to... |
| 12 | Proto-Indo-European | h₂reh₁- | to think, reason; to arrange |
| 13 | Proto-Indo-European | h₂er- | to fit, to fix, to put together |