• 一ひと

  one

• 一いち

  one, 1

• 一線いっせん

  line

• 一軒いっけん

  one house

• 一元いちげん

  unitary

• 一敗いっぱい

  one defeat

• 一打いちだ

  stroke, blow

• 一室いっしつ

  one room

• 一問いちもん

  one question

• 一月ひとつき

  one month

• 一隅いちぐう

  corner, nook

• 一石いっせき

  one game (of go)

• 一首いっしゅ

  one tanka, one poem

• 一戦いっせん

  battle, game, bout

• 一行いちぎょう

  (one) line, (one) row

• 一身いっしん

  oneself, one's body

• 一男いちなん

  boy, eldest son

• 一個いっこ

  one (thing), one piece, one item

• 一挙いっきょ

  one effort, one action

• 一票いっぴょう

  one vote, one ballot

• 一員いちいん

  one person, one member

• 一字いちじ

  (one) letter, (one) character

• 一撃いちげき

  blow, hit, stroke

• 一台いちだい

  one machine, one vehicle

• 一気いっき

  one breath

• 一大いちだい

  one large ..., a great ...

• 一件いっけん

  (one) matter, (one) item, (one) case

• 一例いちれい

  example, an instance

• 一審いっしん

  first instance, first trial

• 一期いちご

  one's whole life, one's lifetime

• 一瞬いっしゅん

  instant, moment, for an instant

• 一丸いちがん

  one lump, one body, one group

• 一端いったん

  one end, an end

• 一足いっそく

  a pair (of shoes or socks)

• 一翼いちよく

  one wing

• 一年いちねん

  one year, some time ago

• 一二いちに

  the first and second, a few

• 一斉いっせい

  simultaneous, all at once

• 一因いちいん

  one cause, one reason, one factor

• 一塁いちるい

  first base

• 一党いっとう

  one party, one faction, one clique

• 一代いちだい

  generation, lifetime, age

• 一変いっぺん

  complete change, about-face

• 一夜いちや

  one night, all night, overnight, one evening

• 一風いっぷう

  oddity, eccentricity, peculiarity

• 一過いっか

  passing (e.g. of a typhoon), going past

• 一枚いちまい

  one (thin, flat object), one sheet

• 一億いちおく

  100,000,000, one hundred million

• 一曲いっきょく

  tune (melody, piece of music)

• 一足ひとあし

  a step