mea culpa

[me-ah kool-pah; English mey-uh kuhl-puh, mee-uh]
Latin.
through my fault; my fault (used as an acknowledgment of one's responsibility).
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Collins
World English Dictionary
mea culpa (ˈmeɪɑː ˈkʊlpɑː)
 
an acknowledgment of guilt
 
[literally: my fault]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

mea culpa
late 14c., from L., lit. "I am to blame," a phrase from the prayer of confession in the L. liturgy.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Cultural Dictionary
mea culpa [(may-uh kul-puh, kool-puh)]

An expresssion from Catholic ritual that assigns blame to oneself: “I gave you the wrong directions to my house — mea culpa.” From Latin, meaning “my fault” or “my blame.”

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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Example sentences
First of all the slur you voiced, mea culpa, shows me that you don't really
  want an answer.
In this case, an orchestrated public mea culpa isn't enough.
His is not the courageous mea culpa it pretends to be.
The latest mea culpa comes in the form of another bomb.
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