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Adjective necessary has 2 senses
- necessary - absolutely essential
Antonyms: unnecessary, unneeded, excess, extra, redundant, supererogatory, superfluous, supernumerary, surplus, gratuitous, needless, uncalled-for, inessential, reserve, spare
- necessary - unavoidably determined by prior circumstances; "the necessary consequences of one's actions"
Antonyms: evitable, avoidable, avertible, avertable (indirect, via inevitable)
Noun necessary has 1 sense
- necessity, essential, requirement, requisite, necessary - anything indispensable; "food and shelter are necessities of life"; "the essentials of the good life"; "allow farmers to buy their requirements under favorable conditions"; "a place where the requisites of water fuel and fodder can be obtained"
--1 is a kind of thing
--1 has particulars: desideratum; must; need, want