celebration
celebrate + -ation
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noun
the action of marking one's pleasure at an important event or occasion by engaging in enjoyable, typically social, activity:
祝賀; (結婚式などを)あげること, 挙行
e.g. the birth of his son was a cause for celebration
祝賀会, 祝典
e.g. a birthday celebration.
ORIGIN
early 16th century: from Latin celebratio(n-), from the verb celebrare (see celebrate).