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lib

[lib]
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noun Informal.
  1. liberation(def 2): women's lib; gay lib.
  2. a libber.
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Origin of lib

First recorded in 1965–70; by shortening

lib.1

  1. book.
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Origin of lib.1

From the Latin word liber

lib.2

Lib.

  1. Liberal.
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ad lib

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

First recorded in 1810–20; see origin at ad libitum

ad lib.

  1. ad libitum.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for lib

lib

noun
  1. informal, sometimes derogatory short for liberation (def. 2)
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lib.

abbreviation for
  1. librarian
  2. library
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Lib.

abbreviation for
  1. Liberal
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for lib

n.

1969, American English, shortening of liberation, used with possessives, originally in Women's Lib. Colloquial shortening libber for liberationist is attested from 1971.

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ad lib

1811, shortened from Latin ad libitum "at one's pleasure, as much as one likes" (c.1600), from libere "to please" (see libido). First recorded as one word 1919 (v.), 1925 (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper

lib in Medicine

ad lib.

abbr.
  1. ad libitum (freely, as desired)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.