verb, noun, punctuation, idiom, particle, place word · to enter or go into a place

此处是大门，游客一律由此处入。

verb · in traditional Chinese phonology, the entering tone (fourth tone category), typically ending in a stop consonant.

入是古代汉语的四个声调之一。

verb · to conform to or agree with a specific style, standard, or custom

他的这种写法完全不入格。

verb · to join an organization or become a member of a group

他在朋友的介绍下入了这一行。

verb · used on product packaging to indicate the quantity of items inside

这盒饼干是十二枚入。