Examples from the Web for o'clock
The governor threatened him with death to-morrow by ten o-clock.Biographia Scoticana (Scots Worthies)|John Howie
By four o-clock it was growing dark, and Mrs. Levice became restless.Other Things Being Equal|Emma Wolf
It was getting on for three o-clock now, and the quality were beginning to arrive.The Elusive Pimpernel|Baroness Emmuska Orczy
British Dictionary definitions for o'clock
Word Origin for o'clock
Word Origin and History for o'clock
c.1720, abbreviation of of the clock (1640s), from Middle English of the clokke (late 14c.). Use of clock hand positions to describe vector directions or angles is from late 18c.