Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: of the clock


o'clock S1 W3

one o'clock/two o'clock etc

TMC one of the times when the clock shows the exact hour as a number from 1 to 12:
It's already 9 o'clock.
The meeting is at 10 o'clock.
O'clock O'clock

Do not use o'clock for times that include minutes or parts of an hour ten past nine (NOT ten past nine o'clock) I get up at 6.30 (NOT 6.30 o'clock) Do not use o'clock when the time is written in the form 1.00, 2.00, 3.00 etc. Write 1 o'clock, 2 am, or simply 3.00.

Dictionary pictures of the day
Do you know what each of these is called?
What is the word for picture 1? What is the word for picture 2? What is the word for picture 3? What is the word for picture 4?
Click on any of the pictures above to find out what it is called.

Explore our topic dictionary