ad lib

[ad lib, ad]
noun
1.
something improvised in speech, music, etc.: Was that joke part of your speech or an ad lib?
adverb
2.
at one's pleasure; without restriction.
3.
freely; as needed; without stint: Water can be given to the patients ad lib.

Origin:
1810–20; see ad libitum

Dictionary.com Unabridged

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

ad lib.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
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
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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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American Heritage
Medical Dictionary

ad lib. abbr.
Latin ad libitum (freely, as desired)

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Abbreviations & Acronyms
ad lib
Latin ad libitum (at pleasure, speak without notes or script—that is, an unscripted comment)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Randomized crossover trial with standardized breakfast and test lunches followed by ad lib meal later in the day.
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