均 means “level, average”

きん · kin

Kun'yomi (Japanese reading)
ならす
On'yomi (Chinese reading)
キン

JLPT N2 · Taught in grade 5 · 7 strokes

The story

Earth (土) spread out evenly (匀): picture a rake smoothing a sand pit flat. 均 is level and even, 平均 is the average, and 100円均一 shops, 百均 for short, sell nearly everything at one price.

Used in 平均 (heikin, average), 均一 (kin'itsu, uniform/flat rate), and 均等 (kintou, equal/even)

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