[oops, oops]
(used to express mild dismay, chagrin, surprise, etc., as at one's own mistake, a clumsy act, or social blunder.)

1925–30; origin uncertain

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
oops (ʊps, uːps)
an exclamation of surprise or of apology as when someone drops something or makes a mistake

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

"a natural exclamation" [OED] of surprise at doing something awkward, but only attested from 1933.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

OOPS definition

"OOPS: A Knowledge Representation Language", D. Vermeir, Proc 19th Intl Hawaii Conf on System Sciences, IEEE (Jan 1986) pp.156-157.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Oops, sorry for my preceding post to you intended for another forum that got mistakenly posted by me here.
Oops, didn't see your parenthetical about how the neutrinos did arrive faster.
Oops, not discipline, each area generally goes with its own format.
The oops moment is when you apply for the loan or credit card and find out you have to pay a fee in advance.
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