| 減る | へる | to decrease (in size or number); to diminish; to abate | n4 |
| 加減 | かげん | degree; extent; amount; balance | n2 |
| 減少 | げんしょう | decrease; reduction; decline | n3 |
| 減らす | へらす | to abate; to decrease; to diminish; to shorten | n3 |
| 軽減 | けいげん | abatement; reduction | n1 |
| 削減 | さくげん | cut; reduction; curtailment | n1 |
| いい加減 | いいかげん | irresponsible; perfunctory; careless; lukewarm | n2 |
| 減じる | げんじる | to decrease; to be reduced; to grow less; to abate | |
| 減塩 | げんえん | reduction of salt; sodium restriction | |
| 低減 | ていげん | decrease; reduction; fall; depreciation | |
| 減 | げん | reduction; decrease; subtraction; reduction of penalty (under the ritsuryō codes) | n1 |
| 増減 | ぞうげん | increase and decrease; fluctuation | |
| 減ずる | げんずる | to decrease; to be reduced; to grow less; to abate | |
| 半減 | はんげん | reduction by half; halving | n2 |
| 減退 | げんたい | decline; ebb; failure; decay | |
| 急減 | きゅうげん | rapid decrease; sharp reduction; sudden drop; recession | |
| 手加減 | てかげん | measuring by feel; adjusting by feel; doing by feel; knack | |
| 減額 | げんがく | reduction (esp. in price or cost); diminution; abatement | |
| 激減 | げきげん | dramatic decrease; sharp drop; sudden fall | n1 |
| 減衰 | げんすい | attenuation; damping; decay | n2 |
| 減速 | げんそく | deceleration | n2 |
| 減量 | げんりょう | loss in weight (esp. body weight); weight reduction; loss in quantity; reduction of quantity | n2 |
| 減殺 | げんさい | lessening; diminishing; reducing | |
| 減点 | げんてん | subtracting points; deducting points; points deducted | n2 |
| 減税 | げんぜい | tax reduction | n1 |
| コスト削減 | コストさくげん | cost reduction; cost saving | |
| 好い加減 | いいかげん | irresponsible; perfunctory; careless; lukewarm | n2 |
| 火加減 | ひかげん | condition of fire; heat level; fire strength | |
| 人口減少 | じんこうげんしょう | depopulation; falling population; decrease in population; population decline | |
| 塩加減 | しおかげん | seasoning with salt; amount of salt | |
| 節減 | せつげん | retrenchment; curtailment; economy | |
| 人員削減 | じんいんさくげん | personnel reduction | |
| 負担軽減 | ふたんけいげん | burden reduction; alleviation of a burden | |
| 減価償却 | げんかしょうきゃく | depreciation | |
| 加減乗除 | かげんじょうじょ | the four arithmetical operations (addition, subtraction, multiplication, division) | |
| 減免 | げんめん | reduction and exemption (e.g. taxes); mitigation and remission (e.g. in criminal law) | |
| 減刑 | げんけい | reduction of penalty; commutation of a sentence | n1 |
| 体重減少 | たいじゅうげんしょう | weight loss; weight reduction; weight decrease | |
| 減らず口 | へらずぐち | impudent talk; speaking without thinking; continuing talking even after one has lost an argument; (getting in) the last word | |
| 軽減税率 | けいげんぜいりつ | reduced tax rate | |
| 減圧 | げんあつ | decompression | |
| すり減る | すりへる | to be worn down; to wear away; to wear out; to dwindle | |
| 減給 | げんきゅう | pay cut; salary cut | n1 |
| 漸減 | ぜんげん | gradual decrease; decline | |
| すり減らす | すりへらす | to wear away; to rub down; to abrade | n1 |
| 減水 | げんすい | subsiding of water | n2 |
| 減食 | げんしょく | cutting down on food intake; reducing rations; reducing allowance of food | n1 |
| 減便 | げんびん | reduction in service (flights, buses, etc.) | |
| 減損 | げんそん | decrease; diminution; loss; impairment | n3 |
| 減算 | げんざん | subtraction | |
| 血小板減少 | けっしょうばんげんしょう | thrombocytopenia | |
| 力加減 | ちからかげん | amount of force (required to do something); (using the) right amount of force; appropriate use of force | |
| 減法 | げんぽう | subtraction | |
| 逓減 | ていげん | gradual decrease; gradual diminution | |
| 水加減 | みずかげん | amount of water | |
| 減俸 | げんぽう | salary reduction; salary cut | |
| 匙加減 | さじかげん | measured amount (esp. of medicine); dosing; quantity; prescription | |
| 血小板減少症 | けっしょうばんげんしょうしょう | thrombocytopenia | |
| 減災 | げんさい | natural disaster reduction; reduction of the effects of a natural disaster | |
| 目減り | めべり | loss (of weight or volume, e.g. in transit); ullage; outage; decrease (in value) | |
| 減配 | げんぱい | reduction in a dividend; smaller ration | |
| 減色 | げんしょく | reduced colours; reduced colors | n1 |
| 減却 | げんきゃく | reduction; decrease | |
| 減収 | げんしゅう | fall; decrease (in income) | |
| 減弱 | げんじゃく | reduction; weakening; attenuation; diminution | |
| 縮減 | しゅくげん | reduction; diminishment; contraction | |
| 減圧症 | げんあつしょう | decompression sickness; the bends | |
| 減価 | げんか | price reduction; depreciation; abatement | n1 |
| 減益 | げんえき | decrease in profits | n1 |
| 減反 | げんたん | reduction (of crop size); reduction of acreage (under cultivation) | |
| 半減期 | はんげんき | half life | |
| 微減 | びげん | slight reduction; small decrease | |
| 減産 | げんさん | decrease in production | |
| 大幅削減 | おおはばさくげん | sharp reduction; drastic cut | |
| 減感 | げんかん | desensitization; hyposensitization | n5 |
| 減車 | げんしゃ | reduction in the number of vehicles, carriages, etc.; reduction in vehicle runs (bus, taxi, etc.) | |
| 人口減 | じんこうげん | population decrease | |
| 減員 | げんいん | reduction of staff | n4 |
| 減摩 | げんま | reduction in friction; lubrication | |
| 減耗 | げんもう | natural decrease | |
| 増減率 | ぞうげんりつ | rate of change | |
| 口減らし | くちべらし | reducing the number of mouths one needs to feed (esp. by giving up children for adoption, apprenticeship, etc.) | |
| 経費削減 | けいひさくげん | reduction of expenditure; reduction of expenses; cost reduction; cost-cutting | |
| 白血球減少 | はっけっきゅうげんしょう | leukopenia; leucopenia | |
| 好加減 | いいかげん | irresponsible; perfunctory; careless; lukewarm | n2 |
| 減数 | げんすう | decreasing in number; subtrahend | |
| 減段 | げんたん | reduction (of crop size); reduction of acreage (under cultivation) | |
| 食欲減退 | しょくよくげんたい | decrease in appetite; loss of appetite | |
| 減光 | げんこう | light reduction; dimming of a light; extinction | n2 |
| 減軽 | げんけい | lessening; reduction; alleviation; reduction (of a sentence) | n1 |
| 減封 | げんぽう | forced reduction of a daimyo's land by the Edo Shogunate; curtailment of a daimyo's domain | |
| 減薬 | げんやく | dose reduction (esp. of antipsychotic drugs); tapering off medication | |
| 味加減 | あじかげん | taste (of prepared dish) | |
| 急減速 | きゅうげんそく | sudden declaration; rapid deceleration; sharp slowdown | |
| 湯加減 | ゆかげん | water temperature (esp. bath) | |
| 予算削減 | よさんさくげん | budget cut | |
| 需要減少 | じゅようげんしょう | reduced demand; decline in demand | |
| 白血球減少症 | はっけっきゅうげんしょうしょう | leukopenia; leucopenia | |
| 減容 | げんよう | volume reduction; reducing volume | |
| 減泊 | げんぱく | shortening one's stay (at a hotel, etc.) | |
| 服加減 | ふくかげん | temperature and flavor (of tea) | |
| 減速材 | げんそくざい | (neutron) moderator | |
| 被減数 | ひげんすう | minuend | |
| 単調減少 | たんちょうげんしょう | monotonic decrease | |
| 減債基金 | げんさいききん | amortization fund; amortisation fund; sinking fund | |
| 減数分裂 | げんすうぶんれつ | meiosis | |
| 負荷軽減 | ふかけいげん | load reduction | |
| 減号 | げんごう | minus sign | |
| 累減 | るいげん | regressive | |
| さじ加減 | さじかげん | measured amount (esp. of medicine); dosing; quantity; prescription | |
| 収穫逓減 | しゅうかくていげん | diminishing returns | |
| 減り込む | めりこむ | to sink (into); to cave in; to get stuck in (e.g. mud); to get bogged down in | |
| 減収減益 | げんしゅうげんえき | decrease in income and profit | |
| 減法混色 | げんぽうこんしょく | subtractive mixture colors | |
| 減税政策 | げんぜいせいさく | tax cut policy; tax reduction policy; tax-abatement policy | |
| 減量経営 | げんりょうけいえい | streamlined management | |
| 減輝 | げんき | decalescence | n5 |
| 減作 | げんさく | poor crop; diminished yield | n2 |
| 減張 | メリハリ | modulation (of voice); variation; variety; balance | n2 |
| 減り張り | メリハリ | modulation (of voice); variation; variety; balance | n2 |
| 良い加減 | いいかげん | irresponsible; perfunctory; careless; lukewarm | n2 |
| 損減 | そんげん | decreasing; diminishing; abating; shortening | n1 |
| 減等 | げんとう | reduction; mitigation; commutation; demotion | n1 |
| 減資 | げんし | reduction of capital | n1 |
| 擦り減らす | すりへらす | to wear away; to rub down; to abrade | n1 |
| 磨り減らす | すりへらす | to wear away; to rub down; to abrade | n1 |
| 減り | へり | decrease; reduction; fall | |
| 減債 | げんさい | partial payment of a debt; reduction of a debt | |
| 減力 | げんりょく | reduction (of a negative) | |
| 減枠 | げんわく | reduction (of an allowance, limit, quota, etc.) | |
| 減歩 | げんぶ | reallocating private land to public use (e.g. parks, roads); reduction in the amount of private land following a land reallocation; reducing the area of private land to reallocate it to public uses | |
| 減流 | げんりゅう | current reduction (usu. electrical) | |
| 減磁 | げんじ | demagnetization | |
| 減磨 | げんま | reduction in friction; lubrication | |
| 減築 | げんちく | reducing the floor space when remodeling a building | |
| 減肉 | げんにく | pipe wall thinning | |
| 減胎 | げんたい | selective reduction; multifetal pregnancy reduction | |
| 減菌 | めっきん | sterilization; sterilisation | |
| 減設 | げんせつ | removal (of equipment, facilities, etc.); scaling back; downgrading | |
| 減音 | げんおん | dampening (sound); diminishing (chord, interval) | |
| 純減 | じゅんげん | net reduction; net decrease | |
| 俯加減 | うつむきかげん | facing slightly downward | |
| 加減酢 | かげんず | mixture of vinegar and some other flavouring (e.g. soy sauce, sugar) | |
| 反動減 | はんどうげん | downturn (as a reaction to some event); decline | |
| 減原発 | げんげんぱつ | reducing dependence on nuclear energy | |
| 減塩食 | げんえんしょく | low-salt diet; low-sodium diet | |
| 減感剤 | げんかんざい | desensitizer | |
| 減算器 | げんざんき | subtracter | |
| 減衰器 | げんすいき | attenuator | |
| 減衰率 | げんすいりつ | attenuation (factor, rate) | |
| 減衰量 | げんすいりょう | attenuation | |
| 減農薬 | げんのうやく | reduction in the use of agricultural chemicals | |
| 累減税 | るいげんぜい | regressive taxation | |
| 評価減 | ひょうかげん | write-down; devaluation | |
| ええ加減 | ええかげん | irresponsible; perfunctory; careless; lukewarm | |
| えー加減 | ええかげん | irresponsible; perfunctory; careless; lukewarm | |
| 一増一減 | いちぞういちげん | 16,800,000-year period over which a human lifespan increases from ten years to 84,000 years (by one year per century) and then decreases back to ten (by one year per century) | |
| 一律減反 | いちりつげんたん | reduction in area of rice under cultivation | |
| 不増不減 | ふぞうふげん | nothing increases or decreases (because all things are void) | |
| 人減らし | ひとべらし | personnel cut; labor cut; labour cut | |
| 俯き加減 | うつむきかげん | facing slightly downward | |
| 債務削減 | さいむさくげん | debt reduction | |
| 全減算器 | ぜんげんさんき | full subtracter | |
| 兵力削減 | へいりょくさくげん | force reduction; troop reduction | |
| 加減算器 | かげんさんき | adder-subtracter | |
| 半減算器 | はんげんさんき | half subtractor | |
| 強熱減量 | きょうねつげんりょう | loss on ignition; ignition loss; LOI | |
| 摩り減る | すりへる | to be worn down; to wear away; to wear out; to dwindle | |
| 擦り減る | すりへる | to be worn down; to wear away; to wear out; to dwindle | |
| 景気減速 | けいきげんそく | economic slowdown | |
| 次元削減 | じげんさくげん | dimensionality reduction; dimension reduction | |
| 減らし目 | へらしめ | decreasing the number of stitches (knitting) | |
| 減三和音 | げんさんわおん | diminished chord; diminished triad | |
| 減反政策 | げんたんせいさく | policy of reducing acreage (under cultivation) | |
| 減圧停止 | げんあつていし | decompression stop (in diving); decompression pause | |
| 減圧手術 | げんあつしゅじゅつ | decompression surgery; surgery under decompression | |
| 減圧潜水 | げんあつせんすい | decompression diving | |
| 減塩醤油 | げんえんしょうゆ | low-salt soy sauce (containing less than 9% salt) | |
| 減塩醬油 | げんえんしょうゆ | low-salt soy sauce (containing less than 9% salt) | |
| 減損会計 | げんそんかいけい | asset-impairment accounting | |
| 減点主義 | げんてんしゅぎ | demerit system; points-off system | |
| 減胎手術 | げんたいしゅじゅつ | selective reduction operation; multifetal pregnancy reduction | |
| 減衰係数 | げんすいけいすう | attenuation coefficient | |
| 減衰定数 | げんすいじょうすう | damping ratio; decay constant | |
| 減衰時間 | げんすいじかん | deceleration time | |
| 減衰歪み | げんすいひずみ | attenuation distortion | |
| 減農薬米 | げんのうやくまい | rice grown with reduced agricultural chemicals | |
| 減速装置 | げんそくそうち | reduction gear | |
| 石油減耗 | せきゆげんもう | oil depletion | |
| 磨り減る | すりへる | to be worn down; to wear away; to wear out; to dwindle | |
| 肉が減る | にくがへる | to slim down; to lose weight | |
| 腹が減る | はらがへる | to become hungry | |
| 腹減った | はらへった | I'm hungry | |
| 荷重減衰 | かじゅうげんすい | weight decay | |
| 賃料減額 | ちんりょうげんがく | rent reduction | |
| 軍備削減 | ぐんびさくげん | arms reduction | |
| 軽減措置 | けいげんそち | relief measure; mitigation measure | |
| 酌量減軽 | しゃくりょうげんけい | reduction of punishment in the light of extenuating circumstances | |
| お腹が減る | おなかがへる | to become hungry | |
| ばかさ加減 | ばかさかげん | extent of (one's) foolishness; degree of stupidity | |
| バカさ加減 | ばかさかげん | extent of (one's) foolishness; degree of stupidity | |
| 加減作用素 | かげんさようそ | adding operator | |
| 加減抵抗器 | かげんていこうき | rheostat; potentiometer; adjustable resistor | |
| 加減演算子 | かげんえんざんし | adding operator | |
| 加減算時間 | かげんさんじかん | add-subtract time | |
| 労働力削減 | ろうどうりょくさくげん | workforce reduction | |
| 反射減衰量 | はんしゃげんすいりょう | return loss | |
| 口の減らん | くちのへらない | always having a comeback; fast-talking | |
| 小腹が減る | こばらがへる | to get a little hungry; to get a bit peckish | |
| 所得税減税 | しょとくぜいげんぜい | income tax cut; income tax reduction | |
| 減価償却費 | げんかしょうきゃくひ | depreciation cost; depreciation expense | |
| 減流抵抗器 | げんりゅうていこうき | current decreasing resistor | |
| 減衰ひずみ | げんすいひずみ | attenuation distortion | |
| 馬鹿さ加減 | ばかさかげん | extent of (one's) foolishness; degree of stupidity | |
| うつむき加減 | うつむきかげん | facing slightly downward | |
| ほろ酔い加減 | ほろよいかげん | state of slight intoxication; being a little drunk | |
| エコー減衰器 | エコーげんすいき | echo suppressor | |
| パソコン減税 | パソコンげんぜい | PC tax reduction | |
| 単調減少数列 | たんちょうげんしょうすうれつ | monotonically decreasing sequence | |
| 口が減らない | くちがへらない | fast-talking; always having another argument ready; not able to keep one's mouth shut; never at a loss for words | |
| 口の減らない | くちのへらない | always having a comeback; fast-talking | |
| 汎血球減少症 | はんけっきゅうげんしょうしょう | pancytopenia | |
| 減基数の補数 | げんきすうのほすう | diminished radix complement; radix-minus-one complement | |
| 環境負荷低減 | かんきょうふかていげん | environmental burden reduction; environmental impact reduction | |
| 行政紙削減法 | ぎょうせいしさくげんほう | Government Paperwork Elimination Act (USA) | |
| 顆粒球減少症 | かりゅうきゅうげんしょうしょう | agranulocytosis | |
| 高性能減水剤 | こうせいのうげんすいざい | superplasticizer | |
| いい加減にしろ | いいかげんにしろ | that's enough!; cut it out!; get a life! | |
| いい加減にする | いいかげんにする | to put an end to something; to get something over with; to quit something one has been engaged in too long or to an excessive degree | |
| 住宅ローン減税 | じゅうたくローンげんぜい | tax deduction on housing loans | |
| 収穫逓減の法則 | しゅうかくていげんのほうそく | law of diminishing returns; law of diminishing marginal returns | |
| 好い加減にする | いいかげんにする | to put an end to something; to get something over with; to quit something one has been engaged in too long or to an excessive degree | |
| 死一等を減ずる | しいっとうをげんずる | to commute a death sentence to life imprisonment | |
| 減光フィルター | げんこうフィルター | neutral-density filter | |
| 脳脊髄液減少症 | のうせきずいえきげんしょうしょう | cerebrospinal fluid hypovolemia; CSF hypovolemia; intracranial hypotension syndrome | |
| 課徴金減免制度 | かちょうきんげんめんせいど | leniency policy; addition to Japan's antitrust law that allows lower fines for the first company involved in a cartel, etc. to admit their involvement | |
| ええ加減にしいや | ええかげんにしいや | shape up!; act properly! | |
| 増えても減っても | ふえてもへっても | more or less | |
| 戦略兵器削減条約 | せんりゃくへいきさくげんじょうやく | Strategic Arms Reduction Treaty; START | |
| 減るもんじゃない | へるもんじゃない | it's no big deal; it's nothing to fret about; it's not like it's the end of the world | |
| 神経をすり減らす | しんけいをすりへらす | to fray one's nerves; to wear out one's nerves; to frazzle one's nerves; to be a nervous wreck | |
| いい加減にしなさい | いいかげんにしなさい | shape up!; act properly! | |
| 二酸化炭素削減目標 | にさんかたんそさくげんもくひょう | CO2-reduction goal | |
| 二酸化炭素削減義務 | にさんかたんそさくげんぎむ | carbon dioxide reducing obligation | |
| 限界効用逓減の法則 | げんかいこうようていげんのほうそく | law of diminishing marginal utility | |
| 限界生産物逓減の法則 | げんかいせいさんぶつていげんのほうそく | law of diminishing marginal product | |
| 腹が減っては戦は出来ぬ | はらがへってはいくさはできぬ | an army marches on its stomach; you can't fight on an empty stomach | |
| 腹が減っては軍は出来ぬ | はらがへってはいくさはできぬ | an army marches on its stomach; you can't fight on an empty stomach | |
| 重症熱性血小板減少症候群 | じゅうしょうねっせいけっしょうばんげんしょうしょうこうぐん | severe fever with thrombocytopenia syndrome; SFTS | |