- next after the forty-ninth; being the ordinal number for 50.
- being one of 50 equal parts.
- a fiftieth part, especially of one (1/50).
- the fiftieth member of a series.
- being the ordinal number of fifty in order, position, time, etc. Often written: 50th
- (as noun)the fiftieth in the series
- one of 50 equal or approximately equal parts of something
- (as modifier)a fiftieth part
- the fraction equal to one divided by 50 (1/50)