界 — “world / boundary” in Japanese

Grade 3かい

Radical ⽥ · radical 102 The building block this kanji is filed under

“world / boundary” in Japanese is 界, read kai (かい). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 世界 (world).

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What does 界 mean?

Full details, readings & example

Kanji	界
Meaning	world / boundary
Readings	かい
Grade	Grade 3 (Medium)
Curriculum	Kyōiku kanji · Japanese elementary school
Example	世界 (world)

How to read 界

界 is read kai (かい) depending on the word.

Words with 界

限界げんかい
世界せかい
世界中せかいじゅう
世界一せかいいち
世界会議せかいかいぎ
世界各国せかいかっこく
世界大会せかいたいかい

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Kanji read the same way as 界

Same sound, different character — the classic trap. Compare them side by side:

Read this character in a real sentence

Updated: 2026-08-28