合
ゴウ, ガッ, カッ, あ.う, あ.う, あ.い, あい, あ.い, あい, あ.わす, あ.わせる, あ.わせる, あう, あん, い, か, こう, ごお, に, ね, や, り, わい

fit, suit, join, 0.1

JLPT3 G2 S6 F41

As per 口# (cavity → open container) + an abbreviated form of 今 (contain) → press/fit together a lid on a container, containing objects inside → *fit*; *join*; *put together*; *meet*. Extended meanings include *suit*; *match*; *agree/coincide with*; *correspond to*; *be correct*; *add* (to); *combine*; *set/adjust* (a device); *adapt oneself to*; and *check* (with/against).

[Full Kanji Etymology List]