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

1820–30; < French improviser, or its source, Italian improvisare (later improvvisare), verbal derivative of improviso improvised < Latin imprōvīsus, equivalent to im- im-2 + prōvīsus past participle of prōvidēre to see beforehand, prepare, provide for (a future circumstance). See proviso

improviser, improvisor, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
improvise (ˈɪmprəˌvaɪz)
1.  to perform or make quickly from materials and sources available, without previous planning
2.  to perform (a poem, play, piece of music, etc), composing as one goes along
[C19: from French, from Italian improvvisare, from Latin imprōvīsus unforeseen, from im- (not) + prōvīsus, from prōvidēre to foresee; see provide]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1826, from Fr. improviser (17c.), from It. improvisare "to sing or speak extempore," from improviso, from L. improvisus "unforeseen, unexpected" (see improvisation).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It allows users to compose, conduct and improvise original music.
The failures of wired combat are forcing troops to improvise a new, socially
  networked kind of war.
No one really understands how to use the machine, so people essentially
Use them to catch rain, cut three holes to improvise a rain poncho, or
  windproof your shelter.
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