legal Definition of floor 1 a: a main level space (as in a stock exchange or legislative chamber) distinguished from a platform or gallery b: members of an assembly
Learner's definition of BIRTHDAY. [count]. 1. : the day when someone was born or the anniversary of that day. â often used before another noun.
A birthday party is a celebration. The definition of a celebration is an act or event designed to commemorate something or make something special and enjoyable. An example of a celebration is a party you have for someone's birthday. celebration. celebration.