eleven o'clock
noun1
The start of the twelfth hour of the day; 11:00 a.m. (11:00).
In both the 12-hour clock and the 24-hour clock
- Breakfast service ends at eleven o'clock (= "Breakfast service ends at 11:00 a.m.").
2
The start of the twenty-fourth hour of the day; 11:00 p.m. (23:00).
Only in the 12-hour clock
- Supper service ends at eleven o'clock (= "Supper service ends at 11:00 p.m.").
3
Informal A position ahead and slightly to the left (horizontal clock orientation) (from the location of the 11 mark on a clock face)
- We've got a bogey at eleven o'clock.
4
Moss-rose purslane, a flowering plant of species Portulaca grandiflora