Denshi Jisho — Online Japanese dictionary

1: reason; principle; logic;
2: (Buddhist term) general principle (as opposed to individual concrete phenomenon);
3: (in neo-Confucianism) the underlying principles of the cosmos
Common word, Noun 
りか science
Common word, Noun, No-adjective 
りじ director; board of directors
Common word, Noun 
りち intellect
Noun 
りひ judgement of right and wrong (judgment)
Noun 
りろ logic; reasoning; argument
Noun 
りかい understanding; comprehension; appreciation; sympathy
Common word, Noun, Suru verb 
りがく 1: physical science (e.g. chemistry, biology, etc.);
2: physics;
3: lixue (Song-era Chinese philosophy);
4: (Archaism) philosophy
Common word, Noun 
りくつ theory; reason
Common word, Noun 
りけい science
Common word, Noun, No-adjective 
りこう science and technology
Common word, Noun 
りせい reason; sense
Common word, Noun 
りそう ideal; dream
Common word, Noun, No-adjective 
りねん (Platonic) ideal (of how things ought to be, e.g. human rights); foundational principle; idea; conception (e.g. of the university); doctrine; ideology
Common word, Noun 
りはつ haircut
Common word, Noun, Suru verb, No-adjective 
りゆう reason; pretext; motive
Common word, Noun 
りろん theory
Common word, Noun 
りかい being aware
Noun, Suru verb 
りかん contemplation of principle
Noun, Buddhist term 
りがい supra-rational
Noun 
りくつ theory; reason
Noun 
りざい finance; economy
Noun 
りしん deism; belief in God as creator of universe
Noun 
りすう science and mathematics
Noun 
りたい 1: (Buddhist term) (Obscure term) essence of all things;
2: noumenon
Noun 
りづめ reasoning; logic; persuasion
Irregular okurigana usage, Noun, No-adjective 
りほう law
Noun 
りよう barbering; haircutting; hairdressing
Noun 
りりき the force (in Star Wars)
Noun 
詰め りづめ reasoning; logic; persuasion
Noun, No-adjective 

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