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.
1. the anniversary of a birth. 2. the day of a person's birth. 3. a day commemorating the founding or beginning of something. [1350â1400]. anniversary  birthday.