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WordReference Random House Learner's Dictionary of American English © 2026 oc•ca•sion /əˈkeɪʒən/USA pronunciation
n.
a particular time, esp. when certain events or circumstances take place:[ countable ] On several occasions he was seen leaving the spy's apartment.
a special or important time, event, ceremony, etc.:[ countable ] The party was quite an occasion.
a convenient or favorable time; opportunity: [ countable ] a good occasion to take inventory of our stock.[ uncountable ] We never had occasion to take that highway.
the immediate cause; reason:[ countable ] What is the occasion for this uproar?
v. [ ~ + object]
to give cause for; bring about:Those actions occasioned hostility and eventually war.
Idioms
Idioms on occasion , [ uncountable ] once in a while; occasionally:to drink on occasion.
WordReference Random House Unabridged Dictionary of American English © 2026 oc•ca•sion
(ə kā′ zhən),USA pronunciation n.
a particular time, esp. as marked by certain circumstances or occurrences:They met on three occasions.
a special or important time, event, ceremony, celebration, etc.:His birthday will be quite an occasion.
a convenient or favorable time, opportunity, or juncture:This slack period would be a good occasion to take inventory.
the immediate or incidental cause or reason for some action or result:What is the occasion for this uproar?
Philosophy (in the philosophy of Alfred North Whitehead) the coincidence of the eternal objects forming a specific point-event.
occasions , [ Obs.]
needs or necessities.
necessary business matters:to go about one's lawful occasions.
Idioms on occasion , now and then; from time to time; occasionally:She visits New York on occasion.
v.t.
to give occasion or cause for; bring about.
Latin occāsiōn- (stem of occāsiō ), equivalent. to oc- oc - + cās (us ) (past participle of cadere to fall, befall) + -iōn- -ion Old French occasion Middle English occasioun 1350–1400
3.See corresponding entry in Unabridged chance, opening. 4.See corresponding entry in Unabridged motive, inducement, influence. See cause. 8.See corresponding entry in Unabridged motivate, originate, produce, create.
Collins Concise English Dictionary © HarperCollins Publishers::
occasion / əˈkeɪʒən / (sometimes followed by of ) the time of a particular happening or event (sometimes followed by for ) a reason or cause (to do or be something); grounds an opportunity (to do something); chance a special event, time, or celebration : the party was quite an occasion on occasion ⇒ every so often rise to the occasion ⇒ to have the courage, wit, etc, to meet the special demands of a situation take occasion ⇒ to avail oneself of an opportunity (to do something) (transitive ) to bring about, esp incidentally or by chance Etymology: 14th Century: from Latin occāsiō a falling down, from occidere, from ob- down + cadere to fall
'on one occasion ' also found in these entries (note: many are not synonyms or translations):