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Definition of improvise : 1. To bring about, arrange, or make, on a sudden, or without previous preparation.
2. To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously.
3. To invent, or provide, offhand, or on the spur of the moment; as, he improvised a hammer out of a stone.
4. To produce or render extemporaneous compositions, especially in verse or in music, without previous preparation; hence, to do anything offhand.

Synonyms:

extemporise, prepared, coin, extemporize, improvize, invent, wing it, ad-lib, planned, fake, make up, devise

choreograph, act, pantomime, dramatize, mime, play, burlesque, characterize, present

Usage examples:

• " But," replied his Minister of the Interior, " one cannot improvise population; ... - "The Life of Napoleon I (Volumes, 1 and 2)", John Holland Rose.
• As he turned away, she glanced at the card- players with a look of horror, as if they were committing sacrilege, and Harcourt had to improvise another poor joke to account for their increasing merriment. - "From Jest to Earnest", E. P. Roe.
• Then under the weird depression and melancholy lassitude which burdened us all, he began to improvise. - "The Portal of Dreams", Charles Neville Buck.