合 means “fit, join”

あう · au

Also: suit, 0.1

Kun'yomi (Japanese reading)
あう, あい, あわす, あわせる
On'yomi (Chinese reading)
ゴウ, ガッ, カッ

JLPT N4 · Taught in grade 2 · 6 strokes

The story

A lid meeting its box in a perfect fit: agreement made visible. Japanese teamwork lives here: 試合 a match, 都合 one's circumstances, 合格 passing the exam, pieces clicking into place.

Used in 合う (au, to fit/match), 試合 (shiai, match/game), and 合格 (goukaku, passing an exam)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.