Adjective requisite has 1 sense
- needed, needful, required, requisite - necessary for relief or supply; "provided them with all things needful"
Antonyms: unnecessary, unneeded (indirect, via necessary)
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Noun requisite 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
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