imperative [adjective]: absolutely necessary; obligatory, unavoidable.
Example: It is imperative that all of us go out and vote on election day.
Related words: imperatively [adverb], imperativeness [noun]
Synonyms: binding, compulsory, critical, crucial, essential, exigent, important, indispensable, inescapable, necessary, obligatory, pressing, urgent, vital
Antonyms: discretionary, elective, inessential, optional, secondary, unnecessary, voluntary
Tags: GRE
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