Ad lib (and ad-lib) are terms derived from the Latin ad libitum, meaning "at one's pleasure". Ad lib is the adjective or adverb; ad-lib is the verb or noun form. Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... Ad libitum is Latin for at ones pleasure, often shortened to Ad lib. ... In grammar, an adjective is a part of speech that modifies a noun or a pronoun, usually by describing it or making its meaning more specific. ... An adverb is a part of speech. ... This article or section is in need of attention from an expert on the subject. ... In English, a noun or noun substantive is a lexical category which can co-occur with (in)definite articles and attributive adjectives, and function as the head of a noun phrase. ...

Most commonly, in drama, the quick-witted invention of dialogue to cover a performer's memory lapse would be an example of an ad-lib. Or, a director might encourage performers to ad-lib in a particular show. (The term ad-lib usually refers to the interpolation of unscripted material in an otherwise scripted performance. When the entire performance is grounded in spontaneous creation, the process is usually called improvisation). This does not cite its references or sources. ... This article belongs in one or more categories. ... A theatre director is a principal in the theatre field who oversees and orchestrates the mounting of a play by unifying various endeavors and aspects of production. ... Philosophically, improvisation often focuses on bringing ones personal awareness into the moment, and on developing a profound understanding for the action one is doing. ...

Live performers such as television talk-show hosts 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. A talk show (U.S.) or chat show (Brit. ...

In music, the term ad lib is used in a similar way to mean an improvised passage. It is also an instruction found in sheet music; see ad libitum. Allegory of Music on the Opéra Garnier Music is an art form that involves organised sounds and silence. ... Sheet music is written representation of music. ... Ad libitum is Latin for at ones pleasure, often shortened to Ad lib. ...

Medical prescriptions may use the abbreviation ad lib. to indicate "freely" or that as much as one desires should be used. A medical prescription ) is an order (often in written form) by a qualified health care professional to a pharmacist or other therapist for a treatment to be provided to their patient. ...