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English definition of “occasion”

occasion

noun [C] uk   /əˈkeɪ.ʒən/ us  
B2 a particular time, especially when something happens or has happened: We met on several occasions to discuss the issue. I've heard him be rude to her on a number of occasions. I seem to remember that on that occasion he was with his wife. B1 a special or formal event: Sara's party was quite an occasion - there were over a hundred people there. At the wedding he sang a song specially written for the occasion. I have a suit but I only wear it on special occasions. The coronation of a new king is, of course, a historic occasion. Congratulations on the occasion of your wedding anniversary. formal an opportunity or reason for doing something or for something to happen: The 200th anniversary of Mozart's death was the occasion for hundreds of special films, books and concerts. An occasion may arise when you can use your knowledge of French. The bride took/used the occasion to make a short speech. on occasion C2 sometimes, but not often: He has, on occasion, made a small mistake.

occasion

verb [T] uk   /əˈkeɪ.ʒən/ formal us  
to cause something: Her refusal occasioned a lot of trouble. [+ two objects] The case occasioned the authorities a lot of worry/The authorities were occasioned a lot of worry by the case.
(Definition of occasion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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