| Term | Definition |
| rirakkusu suru (リラックスする) | to relax |
| rirakkusu shita fun'iki (リラックスした雰囲気) | a relaxed atmosphere |
| rireki (履歴) | one's career, one's past |
| rirekisho (履歴書) | a personal history, a curriculum vitae |
| rirīfutōshu (リリーフ投手) | a relief pitcher |
| ririku (離陸) | a takeoff |
| ririku suru (離陸する) | to take off |
| ririshii (凛々しい) | manly, valiant |
| riritsu (利率) | the rate of interest |
| riroseizentaru (理路整然たる) | logical, consistent |
| riron (理論) | a theory |
| rironteki (理論的) | theoretical |
| rironjō (理論上) | theoretically, in theory |
| risage suru (利下げする) | to reduce the rate of interest, to reduce the interest |
| risai suru (罹災する) | to suffer |
| risaisha (罹災者) | a sufferer, a victim |
| risaichi (罹災地) | the affected districts/area |
| risaikuru suru (リサイクルする) | to recycle |
| risaikuru'undō (リサイクル運動) | the recycling movement |
| risaikurugijutsu (リサイクル技術) | recycling technology |
| risaikurushoppu (リサイクル・ショップ) | a secondhand shop |
| risan suru (離散する) | to be scattered, to be dispersed, to be broken up |
| risei (理性) | reason |
| risei o ushinau (理性を失う) | to lose one's reason |
| riseiteki (理性的) | rational |
| rishi (利子) | interest [-> 利息] |
| rishi ga tsuku (利子がつく) | to bear/yield interest |
| rishi o toru (利子を取る) | to charge interest |
| rishi o harau (利子を払う) | to pay interest |
| murishi de (無利子で) | free of interest, without interest |
| rishoku (利殖) | money-making |
| rishokuhō (利殖法) | money-making scheme |
| rishoku suru (離職する) | to leave one's job, to quit one's job |
| rishokusha (離職者) | unemployed people, jobless people |
| rishō (離昇) | [ロケットの] a lift-off |
| rishū suru (履修する) | to study, to complete, to finish |
| risoku (利息) | interest [-> 利子] |
| rison suru (離村する) | to abandon one's village |
| risō (理想) | an ideal |
| risōtekina (理想的な) | ideal |
| risōkyō (理想郷) | a Utopia |
| risōshugi (理想主義) | idealism |
| risōshugisha (理想主義者) | an idealist |
| risōshugiteki (理想主義的) | idealistic |
| risshiden (立志伝) | the biography of a self-made man |
| risshin suru (立身する) | to rise in the world |
| risshoku (立食) | a stand-up luncheon, a buffet |
| risshō suru (立証する) | to prove, to testify to |
| risshō sareru (立証される) | to be confirmed |
| risshun (立春) | the first day of spring |
| risshū (立秋) | the first day of autumn |
| rissui no yochi mo nai (立錐の余地もない) | to be closely packed, to be filled to capacity |
| rissuru (律する) | to judge [others by oneself], to measure |
| risu (栗鼠) | a squirrel, a chipmunk |
| risuikōji (利水工事) | irrigation works |
| risuru (利する) | to profit, to gain, to do [one] good |
| risutorakucharingu (リストラクチャリング) | (corporate) restructuring |
| ritashugi (利他主義) | altruism |
| ritashugiteki (利他主義的) | altruistic |
| ritchijōken (立地条件) | conditions of location |
| riten (利点) | an advantage |
| ritoku (利得) | profits, benefit, gains, returns, emoluments |
| futōritoku (不当利得) | an undue profit |
| ritō suru (離党する) | to leave a party, to withdraw from a party |
| ritsu (律) | a law; a rhythm |
| ritsu (率) | a rate, a ratio, a percentage |
| ritsu de (率で) | at a rate of, at the rate of |
| ritsu ga yoi (率が良い) | to show a good rate |
| ritsu ga warui (率が悪い) | to show a poor rate |
| ritsuan suru (立案する) | to devise, to design; [草案を] to draft, to plan |
| ritsuansha (立案者) | a deviser, a designer, a planner |
| ritsudō (律動) | a rhythm, a rhythmic movement |
| ritsudōteki (律動的) | rhythmic, rhythmical |
| ritsuki (利付き) | cum interest, with interest, interest on |
| ritsukikin'yūsai (利付き金融債) | an interest-bearing bank debenture |
| ritsumenzu (立面図) | an elevation |
| ritsuron suru (立論する) | to argue, to make an argument |
| ritsuzen to suru (慄然とする) | to be struck with horror, to be filled with horror, to be terrified/horrified, to shudder |
| ritsuzō (立像) | a statue |
| rittai (立体) | a solid, a solid body |
| rittaieiga (立体映画) | a three-dimensional picture, a 3-D picture |
| rittaiongaku (立体音楽) | stereophonic music, three-dimensional music |
| rittaikan (立体感) | a sense of perspective |
| rittaionkyō (立体音響) | a stereophonic sound |
| rittaionkyōsōchi (立体音響装置) | a stereophonic sound system |
| rittaikikagaku (立体幾何学) | solid geometry |
| rittaikōsa (立体交差) | a grade separation, the overpass, a flyover; the underpass; an interchange |
| rittaishi (立太子) | the formal nomination of the Crown Prince |
| rittō (立冬) | the first day of winter |
| riyoku (利欲) | the greed for gain, avarice |
| riyō suru (利用する) | to use, to make (good) use, to utilize, [機会を] to take, to avail oneself of, to take advantage of, [人を] to make a cat's-paw of, to make the best/most of |