eleven o'clock

eleven o'clock (uncountable)

1. (In both the 12-hour clock and the 24-hour clock) The start of the twelfth hour of the day; 11:00 a.m. (11:00).

   Breakfast service ends at eleven o'clock (= "Breakfast service ends at 11:00 a.m.").

2. (Only in the 12-hour clock) The start of the twenty-fourth hour of the day; 11:00 p.m. (23:00).

   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.