occasion

(noun) an event that occurs at a critical time. Synonyms: juncture. Examples: "At such junctures he always had an impulse to leave." "It was needed only on special occasions."

(noun) a vaguely specified social event. Synonyms: affair, social occasion, function, social function. Examples: "The party was quite an affair." "An occasion arranged to honor the president." "A seemingly endless round of social functions."

(noun) reason. Example: "There was no occasion for complaint."

(noun) the time of a particular event. Example: "On the occasion of his 60th birthday."

(noun) an opportunity to do something. Example: "There was never an occasion for her to demonstrate her skill."

(verb) give occasion to.