Meaning of NECESSARY in English

[] adj [ME necessarie, fr. L necessarius, fr. necesse necessary, prob. fr. ne- not + cedere to withdraw--more at no] (14c) 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

[2]necessary n, pl -sar.ies (14c): an indispensable item: essential

Merriam-Webster English vocab.      Английский словарь Merriam Webster.