| 1 | English | functional | In good working order; Useful; serving a purpose,... |
| 2 | French | fonctionnel | functional; Of or relating to bodily functions |
| 3 | French | fonction | function; role |
| 4 | Middle French | function | function |
| 5 | Latin | functiō | — |
| 6 | Latin | -tiō | — |
| 7 | Latin | dissertātiō | — |
| 8 | Latin | dissertus | arranged, disposed; explained |
| 9 | Latin | disserere | second-person singular future passive indicative... |
| 10 | Latin | dis- | asunder, apart, in two; reversal, removal;... |
| 11 | Latin | calceus | shoe |
| 12 | Latin | calx | limestone; chalk; the finish line |
| 13 | Ancient Greek | χάλιξ | small stone, pebble; gravel, rubble |