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1. adjective Of or characterized by an impromptu fashion, with little or no preparation beforehand. Jazz improv is always a bit ad-lib by design; you can't plan what you might play!
2. adverb Done in an impromptu or free-hand fashion, with little or no preparation beforehand. His comedy is always so unique; I hear he does the whole thing ad-lib.
3. noun Something, usually performative in nature, that is done with little or no preparation beforehand. His speech this morning felt like it was a bit of an ad-lib. I don't think he prepared any notes ahead of time.
4. verb To say, do, or perform something in an impromptu fashion, with little or no preparation beforehand. I had forgotten to rehearse my lines for the audition, so I just decided to ad-lib the whole way through.

ad hoc

an ad hoc organization or process is not planned but is formed or arranged when it is necessary for a particular purpose An ad hoc group of 75 parents is leading the protest to demand the resignation of the headteacher. He doesn't charge a set amount for his work but negotiates fees on an ad hoc basis.
See also: ad

ad infinitum

if something happens or continues ad infinitum, it happens again and again in the same way, or it continues forever The TV station just shows repeats of old comedy programmes ad infinitum. Her list of complaints went on and on ad infinitum.
See also: ad

ad nauseam

if someone discusses something ad nauseam, they talk about it so much that it becomes very boring She talks ad nauseam about how brilliant her children are.
See also: ad

ad hoc

For the special purpose or end at hand; also, by extension, improvised or impromptu. The term, Latin for "to this," is most often used for committees established for a specific purpose, as in The committee was formed ad hoc to address health insurance problems. The term is also used as an adjective ( An ad hoc committee was formed), and has given rise to the noun adhocism for the tendency to use temporary, provisional, or improvised methods to deal with a particular problem. [Early 1600s]
See also: ad

ad nauseam

To ridiculous excess, to a sickening degree. For example, I wish he'd drop the subject; we have heard about budget cuts ad nauseam. The term, Latin for "to [the point of] nausea," has been used in English since the early 1600s.
See also: ad
References in periodicals archive ?
tv website you can discover videos, animated ADES trackers, information on future ADES products and presentations of company activities.
The SOLARFARM program was created to facilitate the task of engineering design for customers and installers who want to implant ADES solar trackers into their projects.
SOLARFARM provides a graphic 3D space that allows the analysis and optimization of photovoltaic parks designed with ADES Solar Trackers.
The program combines a simulated time model to spot shadows thrown by the ADES Solar Trackers and potential buildings or obstacles existing in the installation, calculating all possible interference of the sunbeams by the different elements.
ADES is proud to announce the Quality Management System Certification UNE-EN-ISO 9001:2008 Norm for our Solar Trackers and Wind Turbines, both products successfully passing the ISO:9001 audit by the certification authority TUV Rheinland.
The first phase of Sentara's implementation focuses on implementing KBO and Clinical Decision Support for pharmacy drug orders in order to decrease ADEs.