one o'clock

Definitions

1. The start of the second hour of the day; 1:00 a.m. (01:00).
2. The start of the fourteenth hour of the day; 1:00 p.m. (13:00).
3. A position ahead and slightly rightward (horizontal clock orientation) or almost directly above (vertical clock orientation) (from the location of the 1 mark on a clock face)
   informal
4. A dandelion.
   informal

Equivalents

Examples

“The bar closes at one o'clock (= "The bar closes at 1:00 a.m.").”

“The next train⟳ comes at one o'clock (= "The next train⟳ comes at 13:00").”

“We've got a bogey at one o'clock.”

CEFR level