ten o'clock

noun3

1. •
   The start of the eleventh hour of the day; 10:00 a.m. (10:00).

   • The morning coffee break starts at ten o'clock (= "The morning coffee break starts at 10:00 a.m.").
2. •
   The start of the twenty-third hour of the day; 10:00 p.m. (22:00).

   • Supper service ends at ten o'clock (= "Supper service ends at 10:00 p.m.").
3. •
   (informal) A position to the left and slightly ahead (horizontal clock orientation) (from the location of the 10 mark on a clock face)

   • We've got a bogey at ten o'clock.