訂 means “correct, revise”

てい · tei

Also: decide

Kun'yomi (Japanese reading)
ただす
On'yomi (Chinese reading)
テイ

JLPT N1 · Taught in secondary school · 9 strokes

The story

Words (言) beside 丁, a nail: picture each word hammered down until it sits right. 訂正 is a correction, made on Japanese forms with two struck lines and your seal, the 訂正印, and a 改訂版 is a revised edition.

Used in 訂正 (teisei, correction), 改訂 (kaitei, revision), and 改訂版 (kaiteiban, revised edition)

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