o'clock
1
put after the numbers one to twelve to show or tell what time it is, only when it is at that exact hour
- I usually go to bed around 11 o'clock.
- She finishes her piano practice at 7 o'clock.
- The library opens at 10 o'clock on weekdays.
- The restaurant reservation is for 8 o'clock tonight.
- We have a meeting at 10 o'clock in the morning.