occasion

noun

1
an event that occurs at a critical time
at such junctures he always had an impulse to leave
it was needed only on special occasions
2
a vaguely specified social event
the party was quite an affair
an occasion arranged to honor the president
3
reason
there was no occasion for complaint
4
an opportunity to do something
there was never an occasion for her to demonstrate her skill
5
the time of a particular event
on the occasion of his 60th birthday

Also useful for “occasion”:Unscrambler— Rearrange the letters in “occasion”