o'

[ uh, oh ]
/ ə, oʊ /

preposition

an abbreviated form of of, as in o'clock or will-o'-the-wisp.
an abbreviated form of on.

QUIZZES

TAKE ROUND 2 OF OUR PSAT VOCABULARY QUIZ!

Here is our second set of teacher-selected PSAT vocabulary words. Do you know the meanings of these terms?
Question 1 of 10
advocate

Origin of o'

Middle English; by shortening.

Definition for o' (2 of 2)

O'

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

Origin of O'

representing Irish ó descendant, Old Irish au
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for o'

o'
/ (ə) /

preposition

informal, or archaic shortened form of of a cup o' tea
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