• 理り

  reason, principle, logic

• 理論りろん

  theory

• 理想りそう

  ideal, ideals

• 理髪りはつ

  haircut

• 理事りじ

  director, trustee

• 理工りこう

  science and technology

• 理性りせい

  reason, reasoning power, (one's) sense

• 理由りゆう

  reason, grounds, pretext, excuse, motive

• 理解りかい

  understanding, comprehension, appreciation

• 理系りけい

  the sciences, STEM (science, technology, engineering and mathematics)

• 理学りがく

  physical science, natural science

• 理屈りくつ

  theory, reason, logic

• 理科りか

  science (inc. mathematics, medicine, etc.), natural science

• 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

• 監理かんり

  superintendence, supervision, administration

• 総理そうり

  prime minister (as the head of a cabinet government), premier

• 整理せいり

  sorting, arrangement, organization, putting in order, adjustment, regulation

• 道理どうり

  reason, logic, sense, truth, right

• 生理せいり

  physiology

• 受理じゅり

  acceptance

• 修理しゅうり

  repair, mending, fixing, servicing

• 論理ろんり

  logic

• 真理しんり

  truth

• 倫理りんり

  ethics, morals

• 義理ぎり

  duty, sense of duty, honor, honour, decency, courtesy, debt of gratitude, social obligation

• 天理てんり

  natural laws, rule of heaven

• 調理ちょうり

  cooking, food preparation

• 料理りょうり

  cooking, cookery, cuisine, food, dish

• 病理びょうり

  pathology

• 摂理せつり

  laws (of nature)

• 合理ごうり

  rationality

• 推理すいり

  reasoning, inference, deduction

• 原理げんり

  principle, theory, fundamental truth

• 処理しょり

  processing, dealing with, treatment, disposition, disposal

• 物理ぶつり

  laws of nature, physical laws

• 経理けいり

  accounting, administration (of money)

• 代理だいり

  representation, agency, proxy

• 管理かんり

  control, management (e.g. of a business)

• 審理しんり

  trial

• 無理むり

  unreasonable, unnatural, unjustifiable

• 地理ちり

  geography

• 条理じょうり

  reason

• 心理しんり

  state of mind, mentality, psychology

• 理想的りそうてき

  ideal

• 理学部りがくぶ

  faculty of science, school of science, college of science

• 理不尽りふじん

  unreasonable, irrational, outrageous, absurd

• 税理士ぜいりし

  tax counsellor, tax counselor, licensed tax accountant

• 不合理ふごうり

  irrational, illogical, unreasonable, absurd, inconsistent

• 合理化ごうりか

  rationalization, making (something) conform to reason, justification

• 合理的ごうりてき

  rational, reasonable, logical