Meaning of “occasion” - Learner’s Dictionary

occasion

noun us uk /əˈkeɪʒən/
I can't remember what he said on that particular occasion.We don't usually let students take books home, but I'll bend the rules on this occasion.I've asked him to turn his music down on three separate occasions.On previous occasions, she's always introduced herself as the manager.He had been to the museum on two previous occasions.
TIME [ C ]

B2 a time when something happens:

a previous/separate occasion
We met on / several occasions to discuss the issue.
EVENT [ C ]

B1 an important event or ceremony:

a special occasion
She bought a new dress for the occasion.
on occasion(s)

sometimes, but not often:

I only drink alcohol on occasion.

(Definition of “occasion” from the Cambridge Learner’s Dictionary © Cambridge University Press)