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Required; essential. See Synonyms at indispensable.
Something that is indispensable; a requirement: Algebra is a requisite for taking calculus.

[Middle English, from Latin requīsītus, past participle of requīrere, to require; see require.]

req′ui·site·ly adv.
req′ui·site·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.requisiteness - the state of being absolutely required
necessity - the condition of being essential or indispensable
References in periodicals archive ?
One such reason might be this: In the same way that assertion conversationally commits the speaker to the truth of what is asserted, issuing an imperative conversationally commits the speaker to the requisiteness (or oughtness) of the action the imperative instructs.