| 1 | English | unusual | Not usual, out of the ordinary; Something that is... |
| 2 | English | usual | Most commonly occurring; typical; The typical... |
| 3 | Middle English | usual | customary, established; usual, normal, regular |
| 4 | Old French | usuel | — |
| 5 | Latin | usualis | that is for use, that is in service: utilitarian;... |
| 6 | Latin | ūsus | — |
| 7 | Latin | ūtor | — |
| 8 | Proto-Slavic | *ǫtorъ | — |
| 9 | Proto-Slavic | torъ | — |
| 10 | Proto-Slavic | terti | to rub, to scrape; to polish |
| 11 | Proto-Indo-European | terh₁- | to rub, turn; to drill, pierce |