noun
Refers to the rational basis, logical coherence, or underlying principle of something. Often used in phrases like 理にかなう (to be reasonable) or 理をわきまえる (to understand reason).
彼の主張は理にかなっている。
His argument is reasonable.
理をわきまえた行動をとるべきだ。
You should act with an understanding of reason.
noun
general principle (Buddhism)
Buddhist term contrasting universal principle (理) with individual concrete phenomena (事). Rare outside specialized contexts.
See also: 事 (じ)
仏教では、理と事の区別が重要とされる。
In Buddhism, the distinction between principle and phenomenon is considered important.
noun
underlying cosmic principle (neo-Confucianism)
In neo-Confucian thought, 理 denotes the fundamental rational principle governing the cosmos. Highly specialized and rare.
朱子学では、理が万物の根源とされる。
In Zhu Xi's philosophy, li (理) is considered the origin of all things.
理由 is a concrete reason or cause for a specific event, while 理 is the abstract principle or logic behind things.
道理 often refers to moral or natural reason, what is right or proper, whereas 理 is more about rational coherence.
The kanji 理 originally relates to cutting jade along its natural veins, extended to mean 'principle' or 'reason'. The reading り is the on'yomi.