Synonyms for necessary

Noun

1. necessity, essential, requirement, requisite, necessary, thing

usage: 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"

Adjective

1. necessary (vs. unnecessary), essential, indispensable, needed, needful, required, requisite, obligatory, essential, indispensable, obligatory

usage: absolutely essential

2. necessary, inevitable (vs. evitable)

usage: unavoidably determined by prior circumstances; "the necessary consequences of one's actions"