Meaning & readings

wherefore, a reason

On’yomi ユ、ユウ、ユイ
Kun’yomi よし、よ.る

Origin

This character most likely started as a picture of a path or road running through a landscape. The vertical line in the middle represents the path itself, while the rectangular shapes suggest the bounded space or field around it. Over time, the shape became associated with the idea of a "way" or "path," which then extended naturally to mean "reason" or "wherefore"—the sense that a reason is the path or way that leads to an understanding or outcome. The character's simple, geometric form made it easy to write and became standardized in the form we see today.

由 5 strokes

Components

  • 日 radical
  • 丨 radical
  • 日 radical

Common words

  • 経由 けいゆ going through; going via
  • 事由 じゆう reason; cause
  • 自由 じゆう freedom; liberty
  • 由緒 ゆいしょ history; pedigree
  • 由来 ゆらい origin; source
  • 理由 りゆう reason; grounds
  • 自由化 じゆうか liberalization; liberalisation
  • 不自由 ふじゆう discomfort; inconvenience

Easily confused with

These look alike but are unrelated in meaning — check the stroke that differs.

Reference

Strokes
5
Kangxi radical
102
Formation type
Compound ideographic (combined meanings)
Grade
Grade 3 (Kyōiku)
Frequency rank
#325 (newspapers)
Former JLPT
level 2
Unicode
U+07531