| 1 | Middle English | extenden | — |
| 2 | Old French | estendre | to stretch, extend or spread |
| 3 | Latin | extendere | third-person plural perfect active indicative of... |
| 4 | Latin | extendo | I stretch or thrust out; I extend, prolong or... |
| 5 | Latin | ex- | out, away; throughout; thoroughly |
| 6 | Latin | e | The name of the letter "E"; out of, from |
| 7 | Latin | ex | A name of the letter "X"; out of, from |
| 8 | Latin | commūnicō | — |
| 9 | Latin | commūnis | — |
| 10 | Old Latin | com(m)oinis | — |
| 11 | Proto-Italic | kommoinis | — |
| 12 | Proto-Indo-European | ḱom-moy-ni- | held in common |
| 13 | Proto-Indo-European | ḱóm | beside, near, by, with |
| 14 | Proto-Indo-European | ḱe | Deictic particle, here; Post-positional... |
| 15 | Middle English | kyt | — |
| 16 | Russian | кит | whale; genitive plural of ки́та |
| 17 | Old Church Slavonic | китъ | whale |
| 18 | Ancient Greek | κῆτος | whale, sea monster; abyss |