Definitions from Wiktionary (ad lib)

▸ adverb:  At pleasure.
▸ adverb:  At will.
▸ adverb:  As much as desired, to one's fill, without restriction.
▸ adverb:  Extemporaneously.
▸ adjective:  Extemporaneous, impromptu.
▸ noun:  (acting) An instance of something improvised, especially a line.
▸ noun:  (music, chiefly hip-hop) Improvised vocals added after the main vocals have been recorded which serve to emphasize the rhythm or fill the lyrical bar line.
▸ verb:  To perform without script.
▸ verb:  To perform without preparation.
▸ verb:  To perform extemporaneously.
▸ verb:  (music, chiefly hip hop, intransitive) To perform ad libs; to improvise lyrics after the main lyrics have been recorded.
▸ verb:  (music, chiefly hip hop, transitive) To perform (lyrics) as ad libs.
▸ Also see ad_lib

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