ad libbing

ad-lib

[ad-lib, ad-]
verb (used with object), ad-libbed, ad-libbing.
1.
to improvise all or part of (a speech, a piece of music, etc.): to ad-lib one's lines.
verb (used without object), ad-libbed, ad-libbing.
2.
to act, speak, etc., without preparation: Throughout the play he had to ad-lib constantly.
adjective
3.
impromptu; extemporaneous: ad-lib remarks to hecklers.

Origin:
1915–20, Americanism; v. use of ad lib

ad-libber, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ad-lib (ædˈlɪb)
 
vb , -libs, -libbing, -libbed
1.  to improvise and deliver without preparation (a speech, musical performance, etc)
 
adj
2.  improvised; impromptu
 
adv
3.  without restraint; freely
4.  music short for ad libitum
 
n
5.  an improvised performance, often humorous
 
[C18: short for Latin ad libitum, literally: according to pleasure]
 
ad-'libber
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

ad lib
1811, from L. ad libitum "at one's pleasure, as much as one likes" (c.1600), from libere "to please." First recorded as one word 1919 (v.), 1925 (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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