numeral · the number five, used in banking and finance to prevent fraud

这张支票的面额是伍佰元。

measure word · a squad of five soldiers in an ancient military unit

在古代军队里，每五名士兵被编为一伍。

proper name · the surname Wu

伍先生是我们的新经理。

verb · to associate with or be in the company of

他不屑与那些人为伍。