/fɪfθ; fɪfθ/
pron, det 5th; next after fourth 第5, 第五（个）
*the fifth in line 第五行
* Today is the fifth (of March). 今天是（三月）五号.
* the fifth book on the list 书单上的第五本书
* This is the fifth day of the conference. 今天是会议的第五天.
* Edward V, ie Edward the Fifth 爱德华五世. =>App
4 见附录4.

n one of five equal parts of sth 五分之一
*He gave her a fifth of the total amount. 他给了她总量的五分 之一.
* They divided the money into fifths and took one fifth each. 他们把钱分成五份, 每人拿了五分之一.