I. ˈne-sə-ˌser-ē adjective
Etymology: Middle English necessarie, from Latin necessarius, from necesse necessary, probably from ne- not + cedere to withdraw — more at no
Date: 14th century
1.
a. : of an inevitable nature : inescapable
b.
(1) : logically unavoidable
(2) : that cannot be denied without contradiction
c. : determined or produced by the previous condition of things
d. : compulsory
2. : absolutely needed : required
II. noun
( plural -sar·ies )
Date: 14th century
: an indispensable item : essential