| 1 | French | acclimater | to acclimatize |
| 2 | French | climat | climate |
| 3 | Middle French | climat | — |
| 4 | Old French | climat | — |
| 5 | Latin | clima | slope, inclination; A Roman unit of area... |
| 6 | Ancient Greek | κλίμα | a slope, incline, inclination; the supposed slope... |
| 7 | Ancient Greek | κλίνω | to bend, slant; to cause to give way, cause to... |
| 8 | Proto-Indo-European | ḱley- | to shelter, cover; to lean, slope, incline |
| 9 | Proto-Indo-European | ḱel- | to cover; to incline |