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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

Created when necessary for a specific purpose (as opposed to being planned or prepared in advance). The phrase is Latin for "to this." Let's form an ad hoc committee to make some recommendations to the board, and then we'll decide how to address this issue. Ad hoc wireless networks often present security risks to unsuspecting mobile device users.
See also: ad

ad infinitum

Continuously without end. The phrase is Latin for "to infinity." Repairs to the old house seemed to go on ad infinitum—every time we finished a project, another awaited us.
See also: ad

ad nauseam

Continuously and to excess. The phrase is Latin for "to nausea" (to the point that one becomes ill). I couldn't help but check my watch as Beth talked ad nauseam about her boyfriend's accomplishments.
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

ˌad ˈhoc

(from Latin) arranged or happening when necessary and not planned in advance: The meetings will be held on an ad hoc basis.
See also: ad

ˌad infiˈnitum

(from Latin) without ever coming to an end; again and again: You cannot stay here ad infinitum without paying any rent.The problem would be repeated ad infinitum.
The meaning of the Latin phrase is ‘to infinity’.
See also: ad

ˌad ˈnauseam

(from Latin) if a person says or does something ad nauseam, they say or do it again and again so that it becomes boring or annoying: Television sports commentators repeat the same phrases ad nauseam.
The meaning of the Latin phrase is ‘to sickness’.
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.