Noah Webster's Dictionary 1. (v. t.) To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously. 2. (v. t.) To bring about, arrange, or make, on a sudden, or without previous preparation. 3. (v. t.) To invent, or provide, offhand, or on the spur of the moment; as, he improvised a hammer out of a stone. 4. (v. i.) To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand.

Multi-Version Concordance Improvise (1 Occurrence) Amos 6:5 who strum on the strings of a harp; who invent for themselves instruments of music, like David; (See NAS NIV)