再 means “again, re-”

さい · sai

Also: twice, second time

Kun'yomi (Japanese reading)

ふたたび

On'yomi (Chinese reading)

サイ, サ

JLPT N2 · Taught in grade 5 · 6 strokes

The story

Picture a frame with one more crossbar laid over the top: the same thing done a second time. 再 means again: 再び is once more, 再生 is the play button on any video, and 再来週, read さらいしゅう, is the week after next.

Used in 再び (futatabi, again), 再生 (saisei, playback), and 再来週 (saraishuu, the week after next)

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• 減 decrease

Learn 再 and more kanji free on Fuji Learning · All kanji

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