ə̇ˌsenchēˈaləd.ē, (ˌ)eˌs-, ēˌs-, -lətē, -i noun
( -es )
1. : the quality or state of being essential
the essentiality of certain amino acids in the diet for maximum growth of the tissues — Journal American Medical Association
the essentiality of giving special consideration to the needs of older people — New York State Legislative Committee on Problems of the Aging
are not by tradition fearful or quarrelsome over the essentiality of freedom and justice — P.G.Hoffman
2.
a. : the essential nature or character : essence
b. : an essential quality, property, or aspect