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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.
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.
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.
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.
reductio ad Hitlerum
An argument that compares someone or something to Adolf Hitler and/or Nazism, usually as an attempt to nullify the debate or debater. The phrase is modeled on the names of classic logical arguments (e.g. reductio ad absurdum) and is pseudo-Latin for "reduction to Hitler." A: "And anyone who supports that guy is a Nazi!" B: "Geez, it's a little early for reductio ad Hitlerum, don't you think?"
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]
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.
ˌad ˈhoc(from Latin) arranged or happening when necessary and not planned in advance: The meetings will be held on an ad hoc basis.
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’.
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’.