Also "ad libitum." A notation on written music that gives the performer freedom to vary the notes or tempo; in jazz it typically means to improvise freely.
What does up ad-lib mean?
UP AD LIB: Patient may be up and about as desired. AMBULATE: Patient is to be encouraged to be up and about as much as possible. Assistance is given if needed.
Why is it called ad-libs?
In music, biology, and drama, the phrase ad libitum (/ædˈlɪbɪtəm/; from Latin for "at one's pleasure" or "as you desire") often shortened to "ad lib" (as an adjective or adverb) or "ad-lib" (as a verb or noun) has various meanings. ...