<p><strong>Verb (used with object)</strong></p><ul><li>to compose and perform or deliver without previous preparation; extemporize: to improvise an acceptance speech.</li><li>to compose, play, recite, or sing (verse, music, etc.) on the spur of the moment.</li><li>to make, provide, or arrange from whatever materials are readily available: We improvised a dinner from yesterday's leftovers.</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to compose, utter, execute, or arrange anything extemporaneously: When the actor forgot his lines he had to improvise.</li></ul>