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o'

 - 4 dictionary results

o'

[uh, oh]
–preposition
1. an abbreviated form of of, as in o'clock or will-o'-the-wisp.
2. an abbreviated form of on.

Origin:
ME; by shortening.

O'

a prefix meaning “descendant,” in Irish family names: O'Brien; O'Connor.

Origin:
repr. Ir ó descendant, OIr au
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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o'   (ə)   
prep.   Informal
Of: lots o' luck; top o' the morning.

[Middle English o, a, shortening of of; see of.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

O'' 
as a prefix in Irish names, from Ir. ó, ua (O.Ir. au) "descendant."
Online Etymology Dictionary, © 2001 Douglas Harper
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