o'clock (EN)

adverb

adverb “o'clock”

1. used with a numeral from 1 to 12 to indicate a specific hour of the day
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   We have a meeting at seven o'clock sharp, so please arrive early.
2. used with a numeral from 1 to 12 to indicate direction, with twelve being straight ahead
   The captain warned us that an incoming aircraft was at three o'clock, slightly below our altitude.
3. (informal, humorous) used to indicate that it is time for a certain activity
   It's pizza o'clock, so let's order an extra-large pepperoni to celebrate!