|3.||an opportunity (to do something); chance|
|4.||a special event, time, or celebration: the party was quite an occasion|
|5.||on occasion every so often|
|6.||rise to the occasion to have the courage, wit, etc, to meet the special demands of a situation|
|7.||take occasion to avail oneself of an opportunity (to do something)|
|8.||(tr) to bring about, esp incidentally or by chance|
|[C14: from Latin occāsiō a falling down, from occidere, from ob- down + cadere to fall]|
From time to time, now and then, as in Nell has been known to eat meat on occasion. This usage, first in the form of upon occasion, replaced by occasion about 1600.