| essentiality | (n) basic importance, Syn. essentialness, Ant. inessentiality |
| inessentiality | (n) not of basic importance, Ant. essentiality |
| Coessentiality | n. Participation of the same essence. Johnson. [ 1913 Webster ] |
| Essentiality | n. The quality of being essential; the essential part. Jer. Taylor. [ 1913 Webster ] |