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1. New Year's Eve.
2. A religious service held on New Year's Eve.
(in Protestant churches) n
a. the night of December 24, during which a service is held to mark the arrival of Christmas Day
b. the night of December 31, during which a service is held to mark the passing of the old year and the beginning of the new
2. (Protestantism) the service held on either of these nights
1. the last night of the year.
2. a religious service held on this night.