usage: a vaguely specified social event; "the party was quite an affair"; "an occasion arranged to honor the president"; "a seemingly endless round of social functions"
3. affair, occasion, social occasion, function, social function, social event
usage: reason; "there was no occasion for complaint"
4. occasion, reason, ground
usage: the time of a particular event; "on the occasion of his 60th birthday"
5. occasion, time
usage: an opportunity to do something; "there was never an occasion for her to demonstrate her skill"