<p><strong>Adjective</strong></p><ul><li>required or necessary for a particular purpose, position, etc.; indispensable: the requisite skills of an engineer.</li><li>Synonyms: needful, needed</li><li>Antonyms: dispensable</li></ul><p><strong>Noun</strong></p><ul><li>something requisite; a necessary quality, thing, etc.</li><li>Synonyms: necessity</li><li>Antonyms: luxury</li></ul>