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ad libitum

American  
[ad lib-i-tuhm, ahd lib-i-toom] / æd ˈlɪb ɪ təm, ɑd ˈlɪb ɪˌtʊm /

adjective

  1. at one's pleasure.

  2. Music. not obligatory or indispensable. ad lib.


ad libitum British  
/ -ˈlɪbɪtʊm, -təm /

adjective

  1. Often shortened to: ad libmusic (to be performed) at the performer's discretion

"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

Etymology

Origin of ad libitum

Borrowed into English from Latin around 1695–1705

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

In a randomized clinical trial involving adults with overweight, participants who followed an ad libitum low-fat vegan diet substantially reduced the number of calories per gram of food they consumed.

From Science Daily Aug. 17, 2026

Participants were assigned either to an ad libitum low-fat vegan diet centered on fruits, vegetables, grains, and legumes, or to a control group that continued eating as usual without making any dietary changes.

From Science Daily Aug. 17, 2026

One group was permitted ad libitum feeding, which is eating whenever they wanted.

From Salon Jan. 25, 2023

This form of husbandry, known as ad libitum feeding, is cheap and convenient since animal technicians need only check the hoppers from time to time to make sure they haven’t run dry.

From Slate Nov. 16, 2011

A child occupies more than half the space of a grown person, yet children are brought into omnibuses ad libitum.

From The Ladies' Guide to True Politeness and Perfect Manners or, Miss Leslie's Behaviour Book by Eliza Leslie

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