<p><strong>Verb</strong></p><ul><li>(used with object) to have need of; need: He requires medical care.</li><li>to call on authoritatively; order or enjoin to do something: to require an agent to account for money spent.</li><li>to ask for authoritatively or imperatively; demand.</li><li>to impose need or occasion for; make necessary or indispensable: The work required infinite patience.</li><li>to call for or exact as obligatory; ordain: The law requires annual income-tax returns.</li><li>to place under an obligation or necessity: The situation requires me to take immediate action.</li><li>Chiefly British: to desire; wish to have: Will you require tea at four o'clock?</li></ul><p><strong>Antonyms</strong></p><ul><li>forgo</li></ul><p><strong>Synonyms</strong></p><ul><li>necessitate, obligate</li></ul>