v. t. | 1. | To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously. |
| 2. | To bring about, arrange, do, or make, immediately or on short notice, without previous preparation and with no known precedent as a guide. |
| 3. | To invent, or provide, offhand, or on the spur of the moment; as, he improvised a hammer out of a stone. |
v. i. | 1. | To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand. |