| term | pronunciation | English |
|---|
| 一 | イチ、イツ、ひとー、ひと・つ | one |
| 一つ | ひとつ | one thing |
| 一人 | ひとり | one person |
| 一万円 | いちまんえん | ten thousand yen |
| 万が一 | まんがいち | by some rare chance |
| ほぼ一万円 | ほぼいちまんえん | about 10,000 yen |
| 一日中 | いちにちじゅう | all day long |
| もう一つ | もうひとつ | another |
| 万一 | まんいち | by some chance, if by any chance |
| 一人一人 | ひとりひとり | one by one, each, one at a time |
| 一休み | ひとやすみ | a rest |
| 五分の一 | ごぶんのいち | one fifth |
| 十一 | じゅういち | eleven |
| 一台 | いちだい | one (machine, vehicle) |
| 同一の | どういつの | the same (as), identical (with) |
| 同一 | どういつ | identity, sameness, similarity |
| 唯一 | ゆいいつ | only, sole, unique |
| 四分の一 | よんぶんのいち | one quarter |
| 一回 | いっかい | once |
| 均一 | きんいつ | uniformity |
| 一家 | いっか | a house, a home, a family, a household |
| 一年 | いちねん | one year |
| 一度 | いちど | once |
| もう一度 | もういちど | once more |
| 一度に | いちどに | all at once |
| 一応 | いちおう | once, tentatively, in outline, for the time being |
| 一日 | ついたち | first day of the month |
| 一昨日 | おととい | the day before yesterday |
| 一昨年 | いっさくねん | year before last |
| 一時 | いちじ | moment, time |
| 一月 | いちがつ | January |
| 一か月 | いっかげつ | one month |
| 一段と | いちだんと | greater, more, further, still more |
| 一流 | いちりゅう | first class, top grade, foremost, top-notch |
| 一年生 | いちねんせい | first-year student |
| 一生 | いっしょう | lifetime |
| 一番すき | いちばんすき | favourite |
| 一番 | いちばん | number one |
| 一番好き | いちばんすき | favorite |
| 一目で | ひとめで | at a glance |
| 一瞬 | いっしゅん | a moment, an instant |
| 一秒 | いちびょう | second (time) |
| 一種 | いっしゅ | a species, a kind, a variety |
| 統一 | とういつ | unity, consolidation, uniformity |
| 一緒に | いっしょに | together |
| 一緒 | いっしょ | together |
| 一言 | ひとこと | single word |
| 一通り | ひととおり | ordinary, usual, in general, briefly |
| 一里 | いちり | one league |
| 一年間 | いちねんかん | a year |
| 一週間 | いっしゅうかん | one week |
| 一時間 | いちじかん | one hour |
| 一一九番 | ひゃくじゅうきゅうばん | ambulance and fire brigade emergency tel. no. (in Japan) |
| 一丁 | いっちょう | one block (city); piece, an order |
| 一丸 | いちがん | lump, (into) one |
| 一人娘 | ひとりむすめ | an only daughter |
| 一人暮らし | ひとりぐらし | a single life, a solitary life, living alone |
| 一位 | いちい, イチイ | first place; Japanese yew (Taxus cuspidata) |
| 一佐 | いっさ | colonel (JSDF) |
| 一俵 | いっぴょう | one (straw) bagful |
| 一個 | いっこ | piece, fragment, one (object) |
| 一倍 | いちばい | one share, one amount |
| 一億 | いちおく | 100,000,000, one hundred million |
| 一六勝負 | いちろくしょうぶ | gambling, speculation |
| 一六銀行 | いちろくぎんこう | pawnshop |
| 一円 | いちえん | whole district, one yen, throughout |
| 一冊 | いっさつ | one copy (e.g. book) |
| 一分一厘 | いちぶいちりん | (not even) a bit of, (not even) a hint of, (not) an iota of |
| 一分一厘も違わず | いちぶいちりんもたがわず | to be exactly alike |
| 一切 | いっさい | all, everything, without exception, the whole, entirely, absolutely |
| 一刹那 | いっせつな | (a) moment, an instant |
| 一刻 | いっこく | minute, moment, an instant; stubborn, hot-headed |
| 一勺 | いっしゃく | one shaku |
| 一匹 | いっぴき | one animal; two-tan bolt of cloth |
| 一升 | いっしょう | unit of old Japanese liquid measurement, 1800 cc |
| 一升瓶 | いっしょうびん | 1 sho bottle (1.8 litres) |
| 一卵性双生児 | いちらんせいそうせいじ | identical twins |
| 一句 | いっく | phrase (verse, line); one haiku-poem |
| 一句詠む | いっくよむ | to make up a haiku poem |
| 一周 | いっしゅう, ひとめぐり | once around, a revolution, a lap, a turn, a round, one full year |
| 一周年 | いっしゅうねん | one full year |
| 一周忌 | いっしゅうき | first anniversary of death |
| 一喝 | いっかつ | cry in a thundering voice, one roar |
| 一因 | いちいん | cause |
| 一坪本社 | ひとつぼほんしゃ | small company headquarters located in Tokyo simply for name value |
| 一堂 | いちどう | one building (hall, temple, shrine, room) |
| 一塁 | いちるい | first base, (a) fort |
| 一塊 | いっかい, ひとかたまり | one lump, one group |
| 一塊り | いっかい, ひとかたまり | one lump, one group |
| 一夜 | いちや, ひとや, ひとよ | one night, all night, overnight, one evening |
| 一室 | いっしつ | one room |
| 一審 | いっしん | first instance, first trial |
| 一寸 | いっすん | one sun (approx. 3.03 cm); a little bit (of time, distance, etc.) |
| 一寸先 | いっすんさき | an inch ahead, the immediate future |
| 一尉 | いちい | captain (JSDF) |
| 一尺 | いっしゃく | approx. 30 cm |
| 一巡 | いちじゅん | beat, round |
| 一帯 | いったい | region, zone, whole place |
| 一幕 | ひとまく | one act |
| 一弦琴 | いちげんきん | single-stringed Japanese zither |
| 一律 | いちりつ | evenness, uniformity, monotony, equality |
| 一徹 | いってつ | obstinate, stubborn, inflexible |
| 一徹者 | いってつもの | stubborn person |
| 一戸建て | いっこだて | (separate) house |
| 一把 | いちわ | bundle, bunch |
| 一抹 | いちまつ | (a) touch of; one stroke, one brush |
| 一括 | いっかつ | all together, batch, one lump, one bundle, summing up |
| 一括め | ひとくるめ | one bunch, one bundle, one lot |
| 一括払い | いっかつはらい | lump-sum payment |
| 一挙 | いっきょ | one effort, one action |
| 一掃 | いっそう | clean sweep |
| 一握り | ひとにぎり | handful, small handful |
| 一撮 | ひとつまみ | pinch (of something), one piece; easy victory |
| 一撮み | ひとつまみ | pinch (of something), one piece; easy victory |
| 一敗 | いっぱい | one defeat |
| 一斉 | いっせい | simultaneous, all at once |
| 一斉に | いっせいに | simultaneously, all at once |
| 一斉安 | いっせいやす | all-round (market) decline |
| 一斉射撃 | いっせいしゃげき | volley firing, fusillade, broadside |
| 一斉検挙 | いっせいけんきょ | wholesale arrest, round-up |
| 一斉高 | いっせいだか | all-round (market) advance |
| 一斗 | いっと | 1 to (~18l) |
| 一斤 | いっきん | 1 kin (~0.6kg); 1 loaf of bread |
| 一族 | いちぞく | family, relatives, dependents; household |
| 一旦 | いったん | once; for a moment, temporarily; one morning |
| 一旬 | いちじゅん | ten days |
| 一昔 | ひとむかし | ages, long time, decade, the past ten years |
| 一時凌ぎ | いちじしのぎ | makeshift, temporary expedient, stopgap measure |
| 一時賜金 | いちじしきん | lump-sum grant |
| 一晩 | ひとばん | one evening, all night, overnight |
| 一曹 | いっそう | master sergeant (JSDF) |
| 一本杉 | いっぽんすぎ | (a) solitary cryptomeria tree |
| 一本釣り | いっぽんずり, いっぽんづり | fishing with a pole |
| 一条 | いちじょう | streak, matter, quotation |
| 一杯 | いっぱい | cup of ...; full; to the utmost, up to (one's income), (a) lot of, much |
| 一枚 | いちまい | one thin flat object, one sheet |
| 一枚岩 | いちまいいわ | monolithic |
| 一棟 | ひとむね | one house, the same house |
| 一概に | いちがいに | unconditionally, as a rule |
| 一槽式 | いっそうしき | one-part washing machine |
| 一次記憶 | いちじきおく | first memory |
| 一歩 | いっぽ | (a) step; level, stage; small degree, small amount |
| 一殺那 | いっせつな | (a) moment, an instant |
| 一気 | いっき | drink! (said repeatedly as a party cheer) |
| 一汗 | ひとあせ | doing a job, riding and sweating up a horse |
| 一泊 | いっぱく | stopping one night |
| 一泡 | ひとあわ | (a) blow, (a) shock |
| 一泡吹かせる | ひとあわふかせる | to give a surprise (or blow), to scare the hell out of |
| 一滴 | ひとしずく, いってき | drop (of fluid) |
| 一炊の夢 | いっすいのゆめ | an empty dream |
| 一獲千金 | いっかくせんきん | getting rich quick |
| 一環 | いっかん | link (e.g. a part of a larger plan) |
| 一生懸命 | いっしょうけんめい | very hard, with utmost effort, with all one's might, for dear life |
| 一生涯 | いっしょうがい | lifetime, one's whole life, all through life |
| 一男 | いちなん | boy, eldest son |
| 一番鶏 | いちばんどり | first cockcrowing |
| 一畳 | いちじょう | one mat |
| 一癖 | ひとくせ | trait, peculiarity, idiosyncrasy |
| 一皮 | ひとかわ | unmasking |
| 一目瞭然 | いちもくりょうぜん | apparent, obvious, very clear |
| 一眸 | いちぼう | one sweep (of the eye), an unbroken view |
| 一睡 | いっすい | (usu. in negative sentences) (not) a wink of sleep |
| 一睡り | ひとねむり | (usu. in positive sentences) (a) sleep; first sleep of silkworms |
| 一瞬間 | いっしゅんかん | moment, instant |
| 一矢 | いっし | an arrow, (a) retort |
| 一石二鳥 | いっせきにちょう | killing two birds with one stone |
| 一礼 | いちれい | bow (salute, greeting) |
| 一票 | いっぴょう | ballot, vote |
| 一稼ぎ | ひとかせぎ | job, gain |
| 一端 | いったん | one end, an end; part, fragment |
| 一等軍曹 | いっとうぐんそう | sergeant first-class |
| 一筋縄 | ひとすじなわ | (piece of) rope; ordinary method |
| 一箇 | いっこ | piece, fragment, one (object) |
| 一箇年 | いっかねん | one year |
| 一粒 | ひとつぶ | (a) grain |
| 一粒子既約 | いちりゅうしきやく | one particle irreducible (physics) |
| 一粒種 | ひとつぶだね | an only child |
| 一級 | いっきゅう | one grade, first-class, primary |
| 一絃琴 | いちげんきん | single-stringed Japanese zither |
| 一線 | いっせん | line |
| 一群 | いちぐん | group; wide expanse (of flowers) |
| 一翼 | いちよく | (a) part |
| 一致 | いっち | coincidence; conformity; cooperation |
| 一般 | いっぱん | general, liberal, universal, ordinary, average |
| 一般に | いっぱんに | in general |
| 一般会計 | いっぱんかいけい | general accounting and finance |
| 一般化 | いっぱんか | generalization, generalisation, popularization, popularisation |
| 一般幕僚 | いっぱんばくりょう | general staff |
| 一般的 | いっぱんてき | popular, typical, general |
| 一色 | いっしょく, いっしき, ひといろ | one color, one colour, one article |
| 一菊 | いっきく | one scoop (of water) |
| 一蓮托生 | いちれんたくしょう | sharing one's lot with another |
| 一覧 | いちらん | at a glance; (school) catalog, catalogue |
| 一覧表 | いちらんひょう | list, table, schedule, catalogue, catalog |
| 一角 | いっかく, イッカク | corner; one horn; narwhal (Monodon monoceros) |
| 一角獣 | いっかくじゅう | unicorn |
| 一触即発 | いっしょくそくはつ | critical (touch and go) situation, explosive situation |
| 一諾 | いちだく | consent |
| 一貫 | いっかん | consistency; one kan (8.333 lbs) |
| 一貫して | いっかんして | consistently |
| 一躍 | いちやく | (at) one bound |
| 一軒 | いっけん | one house |
| 一軒一軒 | いっけんいっけん | house to house, door to door |
| 一軒家 | いっけんや | detached house, single house; isolated house |
| 一輪挿 | いちりんざし | vase for one flower |
| 一辺倒 | いっぺんとう | complete devotion to one side |
| 一途 | いちず | wholeheartedly, earnestly |
| 一連 | いちれん | series; two reams (i.e. 1000 sheets of paper); verse, stanza |
| 一遍 | いっぺん | once; exclusively, only, alone |
| 一部 | いちぶ | one part; one copy (e.g. of a document) |
| 一郭 | いっかく | one block, enclosure |
| 一酸化炭素 | いっさんかたんそ | carbon monoxide |
| 一里塚 | いちりづか | milestone (1 ri apart) |
| 一錠 | いちじょう | one tablet or pill; tray, salver |
| 一隅 | いちぐう, ひとすみ | corner, nook |
| 一階 | いっかい | one floor, first floor |
| 一隻 | いっせき | one boat, one ship |
| 一隻眼 | いっせきがん | sharp eye, critical eye, discerning eye, an opinion |
| 一頻り | ひとしきり | for a while |
| 一顧 | いっこ | (take no) notice of |
| 一風呂 | ひとふろ | (a) bath |
| 一首 | いっしゅ | tanka, poem |
| 一駄 | いちだ | horse load |
| 一駒 | ひとこま | scene, frame, shot |
| 一騎 | いっき | one horseman |
| 一騎当千 | いっきとうせん | being a match for a thousand, being a mighty warrior (combatant, player) |
| 一騎打ち | いっきうち | personal combat, one-to-one fight |
| 一驚 | いっきょう | surprise, amazement |
| 一鼓 | いっこ | the first beat of the war drum |
| 世界一 | せかいいち | best in the world |
| 二者択一 | にしゃたくいつ | two alternatives, selecting an option (from two alternatives) |
| 人一倍 | ひといちばい | more than others, redoubled, unusual |
| 八紘一宇 | はっこういちう | universal brotherhood, all eight corners of the world under one roof |
| 十一月 | じゅういちがつ | November |
| 単一 | たんいつ | single, simple, sole, individual, unitary |
| 唯一無二 | ゆいいつむに | one and only, unique |
| 尋常一様 | じんじょういちよう | ordinary, common, mediocre |
| 択一 | たくいつ | choosing an alternative |
| 桐一葉 | きりひとは | falling paulownia leaf signaling the beginning of autumn (fall) |
| 泰山鳴動して鼠一匹 | たいざんめいどうしてねずみいっぴき | much ado about nothing, The mountains have have brought forth a mouse (Aesop) |
| 満場一致 | まんじょういっち | unanimous |
| 第一声 | だいいっせい | first tone, first speech |
| 第一歩 | だいいっぽ | first step |
| 終始一貫 | しゅうしいっかん | consistency, unchanging from beginning to end |
| 逐一 | ちくいち, ちくいつ | one by one, in detail, minutely |
| 関税貿易一般協定 | かんぜいぼうえきいっぱんきょうてい | General Agreement on Tariffs and Trade (abolished in 1995), GATT |
| 随一 | ずいいち | best, greatest, first |
| 一千 | いっせん | one thousand |