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Occasion

/əˈkeɪʒən/

An instance or event seen as significant or a reason for celebration.

Synonyms:

'On former occasions,' interrupted Wegg.

This abrupt change was occasioned by her father's face.

Chapter 8: Rise to the occasion.

Originating from the Middle English occasioun, and Old French ocasio(u)n, derived from Latin occasio, meaning a favorable opportunity or a happening.

32 mentions per 1 million words

Often

Hint: Frequency according to COCA