o'clock

US /əˈklɑːk/
UK /əˈklɑːk/
"o'clock" picture
1.

点钟

used after a number from one to twelve to indicate a particular hour when telling the time

:
It's three o'clock.
现在是三点钟
The meeting starts at nine o'clock in the morning.
会议在早上九点钟开始。