ad-lib (?d?l?b?)v. ad-libbed, ad-lib·bing, ad-libs v.tr. To improvise and deliver extemporaneously: ad-lib a comic monologue.v.intr. To engage in improvisation, as during delivery of a speech.n. (?d?l?b?) Words, music, or actions uttered, performed, or carried out extemporaneously.adj. Uttered, performed, or carried out spontaneously: heckled the speaker with ad-lib comments.ad-lib?ber n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.ad-lib (æd?l?b) vb, -libs, -libbing or -libbedto improvise and deliver without preparation (a speech, musical performance, etc)adj (ad lib when predicative) improvised; impromptuadv1. without restraint; freely2. (Classical Music) music short for ad libitumnan improvised performance, often humorous[C18: short for Latin ad libitum, literally: according to pleasure] ad-?libber nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014ad lib (æd ?l?b, ?æd) n. 1. something improvised in speech, music, etc. adv. 2. at one’s pleasure; without restriction. 3. freely; as needed. [1810?20; see ad libitum] ad-lib (æd?l?b, ?æd-) v. -libbed, -lib?bing, adj. v.t. 1. to improvise all or part of (a speech, a piece of music, etc.). v.i. 2. to act, speak, etc., without preparation. adj. 3. impromptu; extemporaneous: ad-lib remarks. [1915?20, Amer.] ad-lib?ber, n. ad lib. ad libitum. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.ad-libPast participle: ad-libbedGerund: ad-libbingImperativePresentPreteritePresent ContinuousPresent PerfectPast ContinuousPast PerfectFutureFuture PerfectFuture ContinuousPresent Perfect ContinuousFuture Perfect ContinuousPast Perfect ContinuousConditionalPast ConditionalImperativead-libad-libPresentI ad-libyou ad-libhe/she/it ad-libswe ad-libyou ad-libthey ad-libPreteriteI ad-libbedyou ad-libbedhe/she/it ad-libbedwe ad-libbedyou ad-libbedthey ad-libbedPresent ContinuousI am ad-libbingyou are ad-libbinghe/she/it is ad-libbingwe are ad-libbingyou are ad-libbingthey are ad-libbingPresent PerfectI have ad-libbedyou have ad-libbedhe/she/it has ad-libbedwe have ad-libbedyou have ad-libbedthey have ad-libbedPast ContinuousI was ad-libbingyou were ad-libbinghe/she/it was ad-libbingwe were ad-libbingyou were ad-libbingthey were ad-libbingPast PerfectI had ad-libbedyou had ad-libbedhe/she/it had ad-libbedwe had ad-libbedyou had ad-libbedthey had ad-libbedFutureI will ad-libyou will ad-libhe/she/it will ad-libwe will ad-libyou will ad-libthey will ad-libFuture PerfectI will have ad-libbedyou will have ad-libbedhe/she/it will have ad-libbedwe will have ad-libbedyou will have ad-libbedthey will have ad-libbedFuture ContinuousI will be ad-libbingyou will be ad-libbinghe/she/it will be ad-libbingwe will be ad-libbingyou will be ad-libbingthey will be ad-libbingPresent Perfect ContinuousI have been ad-libbingyou have been ad-libbinghe/she/it has been ad-libbingwe have been ad-libbingyou have been ad-libbingthey have been ad-libbingFuture Perfect ContinuousI will have been ad-libbingyou will have been ad-libbinghe/she/it will have been ad-libbingwe will have been ad-libbingyou will have been ad-libbingthey will have been ad-libbingPast Perfect ContinuousI had been ad-libbingyou had been ad-libbinghe/she/it had been ad-libbingwe had been ad-libbingyou had been ad-libbingthey had been ad-libbingConditionalI would ad-libyou would ad-libhe/she/it would ad-libwe would ad-libyou would ad-libthey would ad-libPast ConditionalI would have ad-libbedyou would have ad-libbedhe/she/it would have ad-libbedwe would have ad-libbedyou would have ad-libbedthey would have ad-libbedCollins English Verb Tables © HarperCollins Publishers 2011