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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.
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Origin of o'

Middle English; by shortening.

O'

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

representing Irish ó descendant, Old Irish au
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for o'

o'

preposition
  1. informal, or archaic shortened form of of a cup o' tea
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for o'

O'

as a prefix in Irish names, from Irish ó, ua (Old Irish au) "descendant."

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Online Etymology Dictionary, © 2010 Douglas Harper