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
Cite this Entry
“O'clock.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/o%27clock. Accessed 5 Jul. 2026.
Copy CitationKids Definition
o'clock
adverb
o'·clock
ə-ˈkläk 
1
: according to the clock
the time is three o'clock
2
—used for indicating position or direction as if on a clock dial
an airplane approaching at eleven o'clock
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