| 1 | English | favor | A kind or helpful deed; an instance of... |
| 2 | Middle English | favour | — |
| 3 | Anglo-Norman | favour | Late Anglo-Norman spelling of favor |
| 4 | Old French | favor | — |
| 5 | Latin | favor | good will, inclination, partiality, favor;... |
| 6 | Latin | -or | used to form a third-declension masculine... |
| 7 | Proto-Italic | -ōs | Creates masculine action nouns or result nouns... |
| 8 | Proto-Indo-European | -ōs | Creates masculine and feminine action nouns or... |
| 9 | Proto-Indo-European | -oss | — |
| 10 | Proto-Indo-European | -os | Creates action nouns or result nouns from verbs;... |