Definition of "Occasion" :
noun: an event that occurs at a critical time
"It was needed only on special occasions."
noun: a vaguely specified social event
"An occasion arranged to honor the president."
"There was no occasion for complaint."
noun: an opportunity to do something
"There was never an occasion for her to demonstrate her skill."
noun: the time of a particular event
"On the occasion of his 60th birthday."
verb: give occasion to