Word

理想

りそう
ideal; ideals
Word

定理

ていり
theorem; proposition
Word

理念

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
Word

倫理

りんり
ethics; morals
Word

真理

しんり
truth
Word

理学

りがく
physical science (e.g. chemistry, biology, etc.); physics; lixue (Song-era Chinese philosophy); philosophy
Word

合理

ごうり
rational
Word

理科

りか
science
Word

無理

むり
unreasonable; unnatural; unjustifiable; impossible; forcible; forced; compulsory; excessive (work, etc.); immoderate; to work too hard; to try too hard; irrational
Word

病理

びょうり
pathology