seven o'clock
noun1
The start of the eighth hour of the day; 7:00 a.m. (07:00).
In both the 12-hour clock and the 24-hour clock
- The breakfast buffet opens at seven o'clock (= "The breakfast buffet opens at 7:00 a.m.").
2
The start of the twentieth hour of the day; 7:00 p.m. (19:00).
Only in the 12-hour clock
- Supper was served at seven o'clock (= "Supper was served at 7:00 p.m.").
3
Informal A position behind and slightly to the left (horizontal clock orientation) (from the location of the 7 mark on a clock face)
- We've got a bogey at seven o'clock.