| 以前 | いぜん | before; prior to; ago; the past | n4 |
| 以来 | いらい | since; henceforth; ever since | n4 |
| 以降 | いこう | on and after; from ... onward; since | n3 |
| 以後 | いご | after this; from now on; hereafter; thereafter | n1 |
| 所以 | ゆえん | reason; grounds; circumstances | n3 |
| 以下の通り | いかのとおり | as below; as follows | |
| を以て | をもって | with; by; by means of; because of | |
| これ以上 | これいじょう | any more; anymore; any further; any better | |
| それ以上 | それいじょう | further; above (that); greater (than that); any more | |
| 以ての外 | もってのほか | outrageous; preposterous; most improper; most unreasonable | |
| 以東 | いとう | ... and eastward; in and to the east of ... | |
| 以心伝心 | いしんでんしん | telepathy; tacit understanding; thought transference; communion of mind with mind | |
| 以西 | いせい | ... and westward; in and to the west of ... | |
| 一別以来 | いちべついらい | since our last meeting; since we parted | |
| 以南 | いなん | ... and southward; in and to the south of ... | |
| 予想以上 | よそういじょう | more than expected | |
| 以北 | いほく | ... and northward; in and to the north of ... | |
| それ以来 | それいらい | since then; from that time; ever since | |
| 以下略 | いかりゃく | rest omitted; and so on | |
| 以上 | いじょう | not less than ...; ... and over; ... and above; ... and upwards | n4 |
| 以遠 | いえん | beyond; further than | |
| 以往 | いおう | after; ... and later; before; prior to | |
| 自今以後 | じこんいご | henceforth; henceforward; hereafter | |
| 以外 | いがい | excluding; except (for); apart from; other than | n4 |
| 以夷制夷 | いいせいい | controlling foreigners by foreigners; playing one barbarian state against another | |
| 有史以前 | ゆうしいぜん | prehistory | |
| 有史以来 | ゆうしいらい | since the dawn of history | |
| 以下 | いか | not exceeding ...; not more than ...; ... and under; ... and below | n4 |
| 以内 | いない | within; inside of; less than | n4 |
| 前以て | まえもって | in advance; beforehand; previously; ahead of time | n2 |
| 前以って | まえもって | in advance; beforehand; previously; ahead of time | n2 |
| 以て | もって | with; by; by means of; because of | |
| 以深 | いしん | ... or deeper; ... and below | |
| 中以上 | ちゅういじょう | above average | |
| 今以て | いまもって | until now; still; yet; (not) yet | |
| 以って | もって | with; by; by means of; because of | |
| 以呂波 | いろは | traditional ordering of the Japanese syllabary; fundamentals; the ABCs of ... | |
| 以色列 | イスラエル | Israel | |
| 以遠権 | いえんけん | (aeronautical) beyond right | |
| 先以て | まずもって | first of all; in the first place | |
| 尚以て | なおもって | all the more | |
| 斑曹以 | むらそい | spotbelly rockfish (Sebastes pachycephalus) | |
| 縞曹以 | しまそい | threestripe rockfish (Sebastes trivittatus) | |
| 黒曹以 | くろそい | Korean rockfish (Sebastes schlegelii); Schlegel's black rockfish | |
| あれ以来 | あれいらい | since then | |
| なお以て | なおもって | all the more | |
| まず以て | まずもって | first of all; in the first place | |
| を以って | をもって | with; by; by means of; because of | |
| ゼロ以外 | ゼロいがい | non-zero | |
| 人間以上 | にんげんいじょう | More Than Human (1953 novel by Theodore Sturgeon) | |
| 人間以前 | にんげんいぜん | The Pre-Persons (Philip K Dick, 1974) | |
| 以てする | もってする | to do by the use of | |
| 以下同文 | いかどうぶん | same as above; same as in the previous certificate (document, etc.) | |
| 以夷征夷 | いいせいい | controlling foreigners by foreigners; playing one barbarian state against another | |
| 以夷攻夷 | いいこうい | controlling foreigners by foreigners; playing one barbarian state against another | |
| 以毒制毒 | いどくせいどく | using poisonous medication to control poison; fighting evil with evil; fighting fire with fire | |
| 以為らく | おもえらく | it seems (to me); presumably; I think | |
| 先ず以て | まずもって | first of all; in the first place | |
| 先以って | まずもって | first of all; in the first place | |
| 全く以て | まったくもって | as a matter of fact; really; truly; entirely | |
| 友達以上 | ともだちいじょう | more than a friend (implies a degree of intimacy) | |
| 実力以上 | じつりょくいじょう | beyond oneself; beyond one's ability; exceeding one's power | |
| 数分以内 | すうふんいない | within minutes | |
| 整数以外 | せいすういがい | non-integer | |
| 是を以て | これをもって | with this (I) ... | |
| 未生以前 | みしょういぜん | before one's birth; before one was born | |
| 標準以下 | ひょうじゅんいか | below average | |
| 歴史以前 | れきしいぜん | prehistoric | |
| 甚だ以て | はなはだもって | exceedingly | |
| 益々以て | ますますもって | increasingly; more and more; decreasingly (when declining); less and less | |
| 益益以て | ますますもって | increasingly; more and more; decreasingly (when declining); less and less | |
| 神武以来 | じんむこのかた | since the era of the Emperor Jimmu; (first ever) since the dawn of Japan's history; unprecedented | |
| 身を以て | みをもって | with one's own body; by one's own action; by one's own experience; personally | |
| 開闢以来 | かいびゃくいらい | since the beginning of the world; since the dawn of history | |
| これを以て | これをもって | with this (I) ... | |
| その時以来 | そのときいらい | since that time; since then; from that point (on) | |
| まず以って | まずもって | first of all; in the first place | |
| コンマ以下 | コンマいか | after the decimal point; below the decimal; of no account; beneath one's notice | |
| 以ちまして | もちまして | with; by; by means of; because of | |
| 以てしても | もってしても | (not) even with; (not) even using | |
| 以呂波紅葉 | いろはもみじ | Japanese maple (Acer palmatum) | |
| 先ず以って | まずもって | first of all; in the first place | |
| 友だち以上 | ともだちいじょう | more than a friend (implies a degree of intimacy) | |
| 此れを以て | これをもって | with this (I) ... | |
| そのとき以来 | そのときいらい | since that time; since then; from that point (on) | |
| はなはだ以て | はなはだもって | exceedingly | |
| 以ってしても | もってしても | (not) even with; (not) even using | |
| 以て瞑すべし | もってめいすべし | being so content that one would not mind dying; one can now rest in peace; one ought to be contented with what has been accomplished | |
| 文を以て立つ | ぶんをもってたつ | to live by the pen | |
| 以って瞑すべし | もってめいすべし | being so content that one would not mind dying; one can now rest in peace; one ought to be contented with what has been accomplished | |
| 物心ついて以来 | ものごころついていらい | for as long as one can remember | |
| 類を以て集まる | るいをもってあつまる | birds of a feather flock together | |
| 友達以上恋人未満 | ともだちいじょうこいびとみまん | more than friends, less than lovers | |
| 夷を以て夷を制す | いをもっていをせいす | to control foreigners by foreigners; to play one barbarian state against another | |
| 小数点以下の桁数 | しょうすうてんいかのけたすう | number of decimal places | |
| 暴を以て暴に易う | ぼうをもってぼうにかう | to replace one tyranny by another; to use violence against violence | |
| 毒を以て毒を制す | どくをもってどくをせいす | fight fire with fire; set a thief to catch a thief; fight one evil with another | |
| 管を以て天を窺う | くだをもっててんをうかがう | to have a narrow view of things; to look at the sky through a tube | |
| 逸を以て労を待つ | いつをもってろうをまつ | to wait for the enemy to tire at ease | |
| サハラ以南アフリカ | サハラいなんアフリカ | Sub-Saharan Africa | |
| 以外の何者でもない | いがいのなにものでもない | nothing but; nothing more than; nothing less than | |
| 以外の何者でも無い | いがいのなにものでもない | nothing but; nothing more than; nothing less than | |
| 余人を以て代え難い | よじんをもってかえがたい | hard to replace (with other person) | |
| 友だち以上恋人未満 | ともだちいじょうこいびとみまん | more than friends, less than lovers | |
| 理を以て非に落ちる | りをもってひにおちる | to lose an argument despite being in the right; to have the right on one's side, yet succumb to another | |
| 関係者以外立入禁止 | かんけいしゃいがいたちいりきんし | No Unauthorized Persons; No Unauthorized Entry; Authorized Personnel Only | |
| 余人を以て代えがたい | よじんをもってかえがたい | hard to replace (with other person) | |
| 関係者以外立入り禁止 | かんけいしゃいがいたちいりきんし | No Unauthorized Persons; No Unauthorized Entry; Authorized Personnel Only | |
| 他山の石以て玉を攻むべし | たざんのいしもってたまをおさむべし | one should learn from other's mistakes; stones from other mountains can be used to polish one's own gems | |
| それ以上でもそれ以下でもない | それいじょうでもそれいかでもない | no more, no less; that's the entirety of it | |
| 井蛙は以って海を語る可からず | せいあはもってうみをかたるべからず | a narrow-minded person cannot understand the ways of the world; a frog in the well cannot understand the ocean even if it is explained to it | |