/ ˌselɪˈbreɪʃn; NAmE / noun
1.
[ C ] a special event that people organize in order to celebrate sth :
birthday / wedding celebrations
2.
[ U , C ] the act of celebrating sth :
Her triumph was a cause for celebration .
a party in celebration of their fiftieth wedding anniversary
The service was a celebration of his life (= praised what he had done in his life) .
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WORD ORIGIN
early 16th cent.: from Latin celebratio(n-) , from the verb celebrare , from celeber , celebr- frequented or honoured.