ad hoc

[ad hok; Latin ahd hohk]
for the special purpose or end presently under consideration: a committee formed ad hoc to deal with the issue.
concerned or dealing with a specific subject, purpose, or end: The ad hoc committee disbanded after making its final report.

1550–60; < Latin ad hōc for this

ad hoc, a posteriori, a priori, ex post facto, prima facie. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ad hoc (æd ˈhɒk)
adj, —adv
for a particular purpose only; lacking generality or justification: an ad hoc decision; an ad hoc committee
[Latin, literally: to this]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

ad hoc
1650s, from L., lit. "for this (specific purpose)."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
ad hoc [(ad hok, ad hohk)]

A phrase describing something created especially for a particular occasion: “We need an ad hoc committee to handle this new problem immediately.” From Latin, meaning “toward this (matter).”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Computing Dictionary

ad hoc definition

Contrived purely for the purpose in hand rather than planned carefully in advance. E.g. "We didn't know what to do about the sausage rolls, so we set up an ad-hoc committee".

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Idioms & Phrases

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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Yet most of us still have a bunch of ad hoc stuff that doesn't work together.
The smallest of policy decisions are made through faculty governance and ad hoc
Other collaborations between studio members are more ad hoc, especially when
  somebody's got a lot to do in a hurry.
It is a nonsequitur to introduce the evolutionary origins of fruit with the ad
  hoc benefits of spices.
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