| Term | Definition |
| irifune (入船) | an incoming ship |
| iriguchi (入口) | the entrance, the doorway |
| irikomu (入り込む) | to enter (into), to penetrate (into) |
| irikumu (入り組む) | to get/be complicated |
| irikunda (入り組んだ) | complicated, intricate |
| irimajiru (入り交じる) | to mix, to mingle |
| irimidareru (入り乱れる) | to be confused |
| irimidarete (入り乱れて) | in confusion |
| irimuko (入婿) | an adopted husband |
| iritamago (炒り卵) | scrambled eggs |
| iriumi (入海) | a gulf, a bay |
| iro (色) | a colour, a shade; a complexion; a lover, a mistress |
| iro o tsukeru (色をつける) | to add as a bonus |
| iro o ushinau (色を失う) | to turn pale |
| iro o kaeru (色を変える) | to change colour |
| iroai (色合い) | the tone of a colour, a shade |
| irodori (彩り) | colouring, a colour scheme |
| irodoru (彩る) | to colour, to paint, to dye |
| iroenpitsu (色鉛筆) | a colour(ed) pencil |
| irogami (色紙) | a coloured paper |
| irogarasu (色硝子) | stained glass |
| irogoto (色事) | a love affair |
| iroguro no (色黒の) | dark-complexioned, swarthy |
| iroha (いろは) | the (Japanese) syllabary; the rudiments, the ABC |
| iroirona (色々な) | various, all kinds of, various sorts of, several, miscellaneous |
| sono hoka iroiro (そのほか色々) | and what not |
| iroiro arigatō (色々ありがとう) | Thank you for everything |
| irojikake de (色仕掛で) | under pretense of love |
| irojiro no (色白の) | fair-complexioned |
| iroka ni mayou (色香に迷う) | to be captivated by female charms |
| iroke (色気) | tender passion, amorousness |
| iroke no nai (色気のない) | innocent, naïve, unromantic |
| iroke ga nai (色気がない) | to have no sex appeal |
| irokezuku (色気づく) | to be sexually awakened, to begin to think of love |
| ni iroke ga aru (に色気がある) | to be interested in, to have half a mind to [-> 関心] |
| ni kanshin ga aru (に関心がある) | to be interested in, to have half a mind to [-> 色気] |
| irokeshi (色消し) | [Phys.] achromatism |
| irokichigai (色気違い) | erotomania; a sexual maniac |
| irokoi (色恋) | love |
| iromachi (色町) | gay quarters |
| irome (色目) | an amorous glance |
| irome o tsukau (色目を使う) | to make eyes, to ogle |
| iromegane de miru (色眼鏡で見る) | to look at things through coloured spectacles |
| iromeku (色めく) | to become active; to get excited |
| iromono (色物) | coloured fabrics, variety entertainments |
| iron ga aru (異論がある) | to have an objection |
| iron ga nai (異論がない) | to have no objection |
| iron naku (異論なく) | unanimously |
| oironaoshi (お色直し) | the bride's change of costumes |
| iroonna (色女) | a mistress |
| irootoko (色男) | a lover; a lady-killer |
| iroppoi (色っぽい) | amorous, coquettish |
| irori (囲炉裏) | a hearth, a fireplace |
| irotsuya (色艶) | luster, a gloss; a complexion |
| irotsuya no yoi (色艶の良い) | lustrous, healthy |
| irotsuya no warui (色艶の悪い) | lusterless, unhealthy |
| irō suru (慰労する) | to acknowledge a person's services |
| irōkai (慰労会) | a recreation feast |
| irōkin (慰労金) | a reward, a bonus |
| irō naku (遺漏なく) | without omission, without any slip, exhaustively |
| irowake suru (色分けする) | to classify (by colour) |
| iroyoi (色好い) | favourable |
| irozuku (色付く) | to colour, to put on a colour, to turn red/yellow |
| irozuri (色刷) | colour printing; a colour print |
| irozuri ni suru (色刷にする) | to print in colour |
| iru (入る) | to enter, to go in, [日/月が] to set, [季節が] to set in |
| iru (煎る) | to parch, to roast |
| iru (居る) | to be, to exist, there is/are; to stay, to remain; to be present, to happen to be; to be in, to be at home |
| inai (居ない) | to be absent, to be out |
| no iru tokoro de (の居る所で) | in the presence of |
| iru (要る) | to want, to need, to be in need of, to stand in need of, to be necessary, to be needed, to take, to require, to cost |
| iru (射る) | to shoot, to hit |
| iru (鋳る) | to cast, to mold, [貨幣を] to mint |
| irui (衣類) | clothing, clothes, one's wardrobe |
| iruka (海豚) | a porpoise, a dolphin |
| irusu o tsukau (居留守を使う) | to pretend to be out |
| iryoku (威力) | power, might, authority |
| iryoku no aru (威力のある) | powerful, mighty |
| iryō (衣料) | clothing, clothes |
| iryō (医療) | medical treatment |
| iryōkikai (医療器械) | medical instruments |
| iryōshisetsu (医療施設) | surgical facilities |
| iryōhan (医療班) | a medical team |
| iryōhōjin (医療法人) | a medical corporation |
| iryōhoken (医療保険) | medical case insurance |
| iryū suru (慰留する) | to persuade to remain in office, to dissuade from resigning |
| iryūhin (遺留品) | an article left behind, lost articles |
| isagiyoi (潔い) | manly, noble, brave |
| isagiyoku (潔く) | manfully, nobly, bravely |