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系
“system / lineage” in Japanese is 系, read kei (けい). It is a Grade 6 Kyōiku kanji, taught in year 6 of Japanese elementary school, and appears in words such as 体系 (system).
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What does 系 mean?
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太陽系を学ぶ。
たいようけいをまなぶ。I learn about the solar system.
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Full details, readings & example
| Kanji | 系 |
|---|---|
| Meaning | system / lineage |
| Readings | けい |
| Grade | Grade 6 (Hardest) |
| Curriculum | Kyōiku kanji · Japanese elementary school |
| Example | 体系 (system) |
How to read 系
系 is read kei (けい) depending on the word.
Words with 系
- 体系
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Kanji read the same way as 系
Same sound, different character — the classic trap. Compare them side by side:
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Updated: 2026-08-28