part of speech: adjective
definition: coming next after the fourth in a series.
- My locker is the fifth one down from the library door.
part of speech: noun
definition 1: one of five equal parts of a whole; 1/5.
- Each month I pay off a fifth of the money I owe.
definition 2: the number, person, or thing that comes next after the fourth in a series.
- She was the fifth to join the writing club.