necessary
1. neces.sary \'nes-*-.ser-e-\ n 1: an indispensable item : ESSENTIAL; specif : MONEY chiefly NewEng 2: PRIVY 2. necessary aj [ME necessarie, fr. L necessarius, fr. necesse necessary, fr.] ne- not + cedere to withdraw - more at NO, CEDE 1a: of an inevitable nature : INESCAPABLE 1b1: logically unavoidable 1b2: that cannot be denied without contradiction 1c: PREDETERMINED 1d: COMPULSORY 2: absolutely needed : REQUIRED