adjective, numeral, time word, verb, noun · the first of the ten Heavenly Stems; used to denote the first item in a series (A, I, etc.) or an unspecified person (Party A)

他在考试中获得了甲等成绩。

noun, numeral · an ancient civil administration unit in the baojia system or a ranking category in the Imperial examinations

这种甲的组织形式，曾是古代统治者管理地方的主要手段。

numeral · an ancient Chinese compass direction corresponding to 75 degrees

罗盘上的甲位代表七十五度方向。

noun · the hard covering at the end of a finger or toe

他由于受伤，大拇指的甲已经脱落了。

noun · protective covering such as armor plating, a hard shell, or a carapace

古代士兵穿着厚重的铁甲。