Webster's English Dictionary

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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