a particular time at which an event or action occurs
a suitable opportunity or circumstance
hardly the occasion for laughter
formal a state of affairs that provides a reason or grounds
had no occasion to complain
formal the immediate or incidental cause
a remark that was the occasion of the quarrel
a special event or ceremony
on occasion
from time to time
rise to the occasion
to perform well when a situation demands it
take occasion
to make use of an opportunity when it arises
[Middle English via French from Latin occasion-, occasio, from occidere to fall, fall down, happen, from oc- + cadere to fall]