ten o'clock

Short definition from Wiktionary

Noun

1. 1
   The start of the eleventh hour of the day; 10:00 a.m. (10:00).
2. 2
   The start of the twenty-third hour of the day; 10:00 p.m. (22:00).
3. 3
   A position to the left and slightly ahead (horizontal clock orientation) (from the location of the 10 mark on a clock face)