More generally, the phrase ad libitum can be used to indicate an improvisation.
In biological field studies it can also mean that information or data was obtained spontaneously without a specific method. Medical prescriptions may use the abbreviation ad lib. to indicate "freely" or that as much as one desires should be used.
Live performers such as television talk-show hosts (i.e. Jay Leno, David Letterman, etc.) sometimes enhance their reputation for wit by the delivery of material that sounds ad-libbed but is actually scripted, and may employ ad-lib writers to prepare such material.
It is a common misconception that "ad lib" stands for 'adding liberally'. However, although it may hold the same meaning, the origin is not true.
Both Longer Oral Sensory Exposure to and Higher Intensity of Saltiness Decrease Ad Libitum Food Intake in Healthy Normal-Weight Men1-3
Dec 18, 2011; Abstract Orosensory exposure to sweetness has been shown to be important in satiation, whereas the effect of exposure to a salty...
Effects of Providing Water from a Bucket or a Nipple on the Performance and Behavior of Calves Fed Ad Libitum Volumes of Acidified Milk Replacer
Apr 01, 2008; ABSTRACT Little information is available on how much water ad libitum milk-fed calves consume during the milk-feeding stage and...