| 1 | English | essential | Necessary; Very important; of high importance;... |
| 2 | Latin | essentialis | essential; genitive singular of essentiāle |
| 3 | French | essentiel | essential; essential; essence, essential part |
| 4 | Late Latin | essentialis | essential; genitive singular of essentiāle |
| 5 | Latin | essentia | essence, being |
| 6 | Latin | esse | present infinitive of sum; state, condition;... |
| 7 | Ancient Greek | οὐσία | that which is one's own, one's substance,... |
| 8 | Ancient Greek | εἰμί | To be, exist; live; To be; it is possible |
| 9 | Proto-Hellenic | ehmi | to be |
| 10 | Proto-Indo-European | h₁ésmi | first-person singular present indicative of... |
| 11 | Proto-Indo-European | h₁ēs- | — |