/ fɪfθ; NAmE / ordinal number , noun
■ ordinal number
5th :
Today is the fifth (of May).
the fifth century BC
It's her fifth birthday.
My office is on the fifth floor.
It's the fifth time that I've been to America.
Her mother had just given birth to another child, her fifth.
the world's fifth-largest oil exporter
He finished fifth in the race.
Edward V (= Edward the fifth)
■ noun
each of five equal parts of sth :
She cut the cake into fifths.
He gave her a fifth of the total amount.
•
IDIOMS
- take / plead the fifth