#1 occasion n. [juncture] 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". wn
#2 occasion n. [affair, social occasion, function, social function] 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". wn
#3 occasion v. give occasion to. wn
#4 occasion n. reason; "there was no occasion for complaint". wn
#5 occasion n. the time of a particular event; "on the occasion of his 60th birthday". wn
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