o'clock

[ uh-klok ]
/ əˈklɒk /

adverb

of, by, or according to the clock (used in specifying the hour of the day): It is now 4 o'clock.
according to a method for indicating relative position whereby a plane in space is considered to be numbered as a clock's face, with 12 o'clock considered as directly ahead in horizontal position or straight up in vertical position.

QUIZZES

HEED THE VOX POPULI, AND TAKE THIS WORD OF THE DAY QUIZ!

Test your memory on these verbal firecrackers from the week of June 29 to July 5!
Question 1 of 7
anchorite

Origin of o'clock

First recorded in 1710–20; see origin at o', clock1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for o'clock

British Dictionary definitions for o'clock

o'clock
/ (əˈklɒk) /

adverb

used after a number from one to twelve to indicate the hour of the day or night
used after a number to indicate direction or position relative to the observer, twelve o'clock being directly ahead or overhead and other positions being obtained by comparisons with a clock face

Word Origin for o'clock

C18: abbreviation for of the clock
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