1 absolutely essential; indispensable
2 something indispensable; necessity
(C15: from Latin requisitus sought after, from requirere to seek for, require)
English Collins Dictionary - English Definition & Thesaurus
adj called for, essential, indispensable, mandatory, necessary, needed, needful, obligatory, prerequisite, required, vital
n condition, desideratum, essential, must, necessity, need, precondition, prerequisite, requirement, sine qua non
English Collins Dictionary - English synonyms & Thesaurus
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"