| 原因 | げんいん | cause; origin; source | n4 |
| 要因 | よういん | main cause; primary factor | n2 |
| 因縁 | いんねん | fate; destiny; connection; tie | |
| 因 | いん | cause; factor; hetu (direct cause, esp. as opposed to indirect conditions); the basis of one's argument (in hetuvidya) | |
| 因果 | いんが | cause and effect; causality; karma; fate | |
| 因る | よる | to be due to; to be caused by; to depend on; to turn on | n5 |
| 起因 | きいん | to be caused by; to result from; to arise from; to stem from | |
| 因子 | いんし | factor; factor; divisor | n1 |
| 死因 | しいん | cause of death | |
| 一因 | いちいん | one cause; one reason; one factor | n2 |
| 動因 | どういん | drive; motive; agent | |
| 因襲 | いんしゅう | convention; tired tradition; old custom | |
| 因む | ちなむ | to be associated (with); to be connected (with) | |
| 因業 | いんごう | heartless; cruel; causes and actions; results of actions in previous life | |
| 因幡 | いなば | Inaba (former province located in the east of present-day Tottori Prefecture) | |
| 因習 | いんしゅう | convention; tired tradition; old custom | |
| 誘因 | ゆういん | contributing cause; exciting cause; incentive; motive | n1 |
| 因循 | いんじゅん | indecision; vacillation | |
| 本因坊 | ほんいんぼう | Hon'inbō; Honinbo; grandmaster | |
| 素因 | そいん | basic factor; (medical) predisposition; diathesis | |
| 因みに | ちなみに | by the way; in this connection; incidentally; in passing | n3 |
| 因果律 | いんがりつ | law of cause and effect; principle of causality | |
| 因果応報 | いんがおうほう | retribution; retributive justice; karma; just deserts | |
| 成因 | せいいん | origin; cause | n1 |
| 因果関係 | いんがかんけい | relation of cause and effect; causal relationship; causal link; causality | |
| 遠因 | えんいん | remote cause; underlying cause; indirect cause | |
| 敗因 | はいいん | cause of defeat | |
| 主因 | しゅいん | primary cause; main factor | n1 |
| 病因 | びょういん | the cause of a disease | n5 |
| 原因不明 | げんいんふめい | cause unknown | |
| 本因坊戦 | ほんいんぼうせん | Hon'inbō Tournament (annual professional go competition); Honinbo Tournament | |
| 内因性 | ないいんせい | endogenous; intrinsic | |
| 素因数分解 | そいんすうぶんかい | prime factorization; prime decomposition | |
| 因果性 | いんがせい | causality | |
| 原因究明 | げんいんきゅうめい | investigation to determine the cause (of); tracing something back to its origin | |
| 真因 | しんいん | true reason; true motive | |
| 心因 | しんいん | psychogenesis | |
| 原因菌 | げんいんきん | causative microorganism; pathogenic bacteria; pathogen | |
| 素因数 | そいんすう | prime factor | |
| 近因 | きんいん | immediate cause; proximate cause | |
| 因数 | いんすう | factor | |
| 悪因 | あくいん | root of evil; bad cause | |
| 悪因悪果 | あくいんあっか | sow evil and reap evil; evil acts bring evil outcomes | |
| 危険因子 | きけんいんし | risk factor | |
| 因明 | いんみょう | hetuvidya (ancient Indian logic for determining right from wrong, truth from falsehood, etc.) | |
| 因由 | いんゆ | cause | |
| 外的要因 | がいてきよういん | external factor; external cause; extrinsic factor | |
| 因数分解 | いんすうぶんかい | factorization; factorisation | |
| 主要因 | しゅよういん | primary factor; main cause | |
| 外因 | がいいん | external cause; external origin; exogenous cause | |
| 外因性 | がいいんせい | exogenous; extrinsic | |
| 増殖因子 | ぞうしょくいんし | (cell) growth factor | |
| 内因 | ないいん | internal cause; intrinsic motivation | |
| 訴因 | そいん | charge; count | |
| 因果的 | いんがてき | causal | |
| 偶因 | ぐういん | contingent cause | |
| 凝固因子 | ぎょうこいんし | coagulation factor; clotting factor | |
| 因子分析 | いんしぶんせき | factor analysis | |
| 究極要因 | きゅうきょくよういん | ultimate cause (in contrast to a proximate cause) | |
| 至近要因 | しきんよういん | proximate cause (in contrast to an ultimate cause) | |
| 勝因 | しょういん | cause of victory; reason for (one's) success | |
| 原因分析 | げんいんぶんせき | cause analysis; causal analysis; diagnosis | |
| 転写因子 | てんしゃいんし | transcription factor | |
| 遺伝的素因 | いでんてきそいん | hereditary predisposition; genetic predisposition | |
| 経済的要因 | けいざいてきよういん | economic factor | |
| 導因 | どういん | incentive; inducement | |
| 主原因 | しゅげんいん | principal cause | |
| 質料因 | しつりょういん | material cause (one of Aristotle's four fundamental types of answer to the question "why?") | |
| 内的要因 | ないてきよういん | internal factor; internal cause; intrinsic factor | |
| 成長因子 | せいちょういんし | (cell) growth factor | |
| 因習的 | いんしゅうてき | conventional | |
| 形相因 | けいそういん | formal cause (one of Aristotle's four fundamental types of answer to the question "why?") | |
| 原因調査 | げんいんちょうさ | investigation (to determine the cause of something) | |
| 動力因 | どうりょくいん | efficient cause (one of Aristotle's four fundamental types of answer to the question "why?") | |
| 目的因 | もくてきいん | final cause (one of Aristotle's four fundamental types of answer to the question "why?") | |
| 事故原因 | じこげんいん | source, cause of an accident | |
| 因数定理 | いんすうていり | factor theorem | |
| 因果覿面 | いんがてきめん | the swiftness of retributive justice | |
| 謂れ因縁 | いわれいんねん | origin; history | |
| 善因 | ぜんいん | good cause (that will bring a good reward); good deed | n3 |
| 因美線 | いんびせん | Inbi Line (East Okayama Railway) | |
| 業因 | ごういん | karma | n2 |
| 三因 | さんいん | three causes of Buddha nature | |
| 副因 | ふくいん | secondary cause | |
| 画因 | がいん | art motif | |
| 作用因 | さよういん | efficient cause (one of Aristotle's four fundamental types of answer to the question "why?") | |
| 起因性 | きいんせい | -induced | |
| 原因療法 | げんいんりょうほう | definitive therapy | |
| 因果的閉包性 | いんがてきへいほうせい | causal closure; physical causal closure | |
| 因に | ちなみに | by the way; in this connection; incidentally; in passing | n3 |
| 約因 | やくいん | consideration (in contract law, the thing given or done by the promisee in exchange for the promise) | n1 |
| 二因 | にいん | two causes | |
| 因み | ちなみ | association; link; connection; pledge (esp. for marriage) | |
| 因州 | いんしゅう | Inaba (former province located in the east of present-day Tottori Prefecture) | |
| 基因 | きいん | to be caused by; to result from; to arise from; to stem from | |
| 従因 | じゅういん | secondary cause | |
| 禍因 | かいん | cause of trouble | |
| に因り | により | according to; by (means of); due to; because of | |
| に因る | による | by means of; due to; because of; according to | |
| 余因子 | よいんし | cofactor | |
| 保因者 | ほいんしゃ | (hereditary) carrier; (asymptomatic) carrier | |
| 偶因論 | ぐういんろん | occasionalism | |
| 公因数 | こういんすう | common factor | |
| 内因死 | ないいんし | death from natural causes | |
| 因って | よって | therefore; consequently; accordingly; for that reason | |
| 因りて | よりて | as such; for that reason; therefore; consequently | |
| 因備線 | いんびせん | Inbi Line | |
| 因州弁 | いんしゅうべん | Inshū dialect (spoken in eastern Tottori) | |
| 因果者 | いんがもの | unlucky person | |
| 外因死 | がいいんし | death by physical trauma; violent death; exogenous death; death by an external cause | |
| 心因性 | しんいんせい | psychogenic; psychogenetic | |
| 悪因縁 | あくいんねん | evil destiny | |
| 病因学 | びょういんがく | etiology; aetiology | |
| 補因子 | ほいんし | cofactor (biochemistry) | |
| 零因子 | ゼロいんし | zero divisor; null factor; nil factor | |
| に因って | によって | according to; due to; by (means of); because of | |
| に因らず | によらず | regardless of; irrespective of; independently of; despite | |
| に因れば | によれば | according to (someone) | |
| に因んで | にちなんで | named after; associated with; connected with | |
| 三世因果 | さんぜいんが | retribution spanning the three temporal worlds (present, past, future) | |
| 三因仏性 | さんいんぶっしょう | three causes of Buddha nature | |
| 共同因子 | きょうどういんし | cofactor | |
| 共通因数 | きょうつういんすう | common factor | |
| 十二因縁 | じゅうにいんねん | the twelve nidanas (continuum of twelve phases that lead to suffering) | |
| 原因結果 | げんいんけっか | cause and effect; causality | |
| 善因善果 | ぜんいんぜんか | good actions lead to good rewards; one good turn deserves another | |
| 因りけり | よりけり | depends on | |
| 因をなす | いんをなす | to give rise to; to cause | |
| 因を成す | いんをなす | to give rise to; to cause | |
| 因子集合 | いんししゅうごう | factor set | |
| 因循姑息 | いんじゅんこそく | dilly-dallying and temporizing (temporising) | |
| 因果因縁 | いんがいんねん | cause and effect; karma; retribution; an evil cause producing an evil effect | |
| 因果法則 | いんがほうそく | law of causality | |
| 因縁生起 | いんねんせいき | dependent arising; doctrine that everything has a cause and there is nothing that arises out of nothing | |
| 因習道徳 | いんしゅうどうとく | conventional morality; conventional morals | |
| 心因反応 | しんいんはんのう | psychogenic reaction | |
| 直接要因 | ちょくせつよういん | direct cause; proximate cause | |
| 致死因子 | ちしいんし | lethal factor; lethal gene | |
| 遺伝因子 | いでんいんし | gene; genetic factor; genetic element | |
| Rh因子 | アールエッチいんし | Rh factor; Rhesus factor | |
| プラス要因 | プラスよういん | positive factor; contributing (positive) factor | |
| ベイズ因子 | ベイズいんし | Bayes factor | |
| リスク要因 | リスクよういん | risk factor | |
| 因って来る | よってきたる | originating; causing; beginning | |
| 因幡の白兎 | いなばのしろうさぎ | White Hare of Inaba | |
| 因幡の素兎 | いなばのしろうさぎ | White Hare of Inaba | |
| 心因性反応 | しんいんせいはんのう | psychogenic reaction | |
| 心因性目眩 | しんいんせいめまい | psychogenic vertigo; functional dizziness | |
| 心因性眩暈 | しんいんせいめまい | psychogenic vertigo; functional dizziness | |
| 機会原因論 | きかいげんいんろん | occasionalism | |
| 鉱床成因論 | こうしょうせいいんろん | metallogeny; ore genesis | |
| マイナス要因 | マイナスよういん | detrimental factor; contributing negative factor | |
| 原因ウィルス | げんいんウイルス | causal virus; causative virus | |
| 原因ウイルス | げんいんウイルス | causal virus; causative virus | |
| 因って来たる | よってきたる | originating; causing; beginning | |
| 因果を含める | いんがをふくめる | to persuade someone to accept the inevitable | |
| 因縁をつける | いんねんをつける | to invent a pretext for a quarrel; to pick a fight | |
| 因縁を付ける | いんねんをつける | to invent a pretext for a quarrel; to pick a fight | |
| 外因損失時間 | がいいんそんしつじかん | environmental loss time; external loss time | |
| 天然保湿因子 | てんねんほしついんし | natural moisturizing factor; NMF | |
| 心因性めまい | しんいんせいめまい | psychogenic vertigo; functional dizziness | |
| 惚れたが因果 | ほれたがいんが | no matter how unfortunate it is, you cannot stop love; falling in love is an unfortunate fate | |
| 腫瘍壊死因子 | しゅようえしいんし | tumor necrosis factor (e.g. cachexin); tumour necrosis factor; TNF | |
| 血液凝固因子 | けつえきぎょうこいんし | blood coagulation factor | |
| ブロック化因数 | ブロックかいんすう | blocking factor | |
| 因る所が大きい | よるところがおおきい | depending largely on; playing a large role in; due largely to | |
| 因果の胤を宿す | いんがのたねをやどす | to become pregnant with an illegitimate child | |
| 遺伝因子組替え | いでんいんしくみかえ | recombinant gene splicing | |
| 上皮細胞成長因子 | じょうひさいぼうせいちょういんし | epidermal growth factor; EGF | |
| 血管内皮増殖因子 | けっかんないひぞうしょくいんし | vascular endothelial growth factor; VEGF | |
| 因るところが大きい | よるところがおおきい | depending largely on; playing a large role in; due largely to | |
| 親の因果が子に報う | おやのいんががこにむくう | the sins of the father shall be visited upon the son | |
| 赤血球生成促進因子 | せっけっきゅうせいせいそくしんいんし | erythropoietin; EPO | |
| インスリン様成長因子 | インスリンようせいちょういんし | insulin-like growth factor; IGF | |
| 原因において自由な行為 | げんいんにおいてじゆうなこうい | actio libera in causa; manufacturing the conditions of one's own defence (e.g. getting drunk in order to commit a crime) | |
| マクロファージ遊走阻止因子 | マクロファージゆうそうそしいんし | macrophage migration inhibitory factor; MMIF | |
| 組織プラスミノーゲン活性化因子 | そしきプラスミノーゲンかっせいかいんし | tissue plasminogen activator; tPA; PLAT | |