Definition of o'clock
1 : according to the clock the time is three o'clock
2 —used for indicating position or direction as if on a clock dial that is oriented vertically or horizontally an airplane approaching at six o'clock
From the M-W Editors
Origin and Etymology of o'clock
contraction of of the clock
O'CLOCK Defined for English Language Learners
O'CLOCK Defined for Kids
o'clock
playDefinition of o'clock for Students
: according to the clock The time is one o'clock.
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See words that rhyme with o'clock Spanish Central: Translation of o'clock Nglish: Translation of o'clock for Spanish speakers
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