• 以来いらい

  since, henceforth

• 以内いない

  within, inside of, less than

• 以降いこう

  on and after, from ... onward, since

• 以後いご

  after this, from now on, hereafter

• 以前いぜん

  before, prior to, ago

• 以外いがい

  excluding, except (for), apart from, other than, besides, in addition to

• 以上いじょう

  not less than ..., ... and over, ... and above, ... and upwards, ... or more

• 以下いか

  not exceeding ..., not more than ..., ... and under, ... and below, ... or fewer

• 以てもって

  with, by, by means of

• 以色列イスラエル

  Israel

• 予想以上よそういじょう

  more than expected

• 以遠いえん

  beyond, further than

• 以深いしん

  ... or deeper, ... and below

• 以南いなん

  ... and southward, in and to the south of ...

• 以東いとう

  ... and eastward, in and to the east of ...

• 以西いせい

  ... and westward, in and to the west of ...

• 以北いほく

  ... and northward, in and to the north of ...

• 以往いおう

  after, ... and later

• 所以ゆえん

  reason, grounds

• 以下略いかりゃく

  rest omitted, and so on

• 以遠権いえんけん

  (aeronautical) beyond right

• 尚以てなおもって

  all the more

• 黒曹以くろそい

  Korean rockfish (Sebastes schlegelii), Schlegel's black rockfish

• 斑曹以むらそい

  spotbelly rockfish (Sebastes pachycephalus)

• 縞曹以しまそい

  threestripe rockfish (Sebastes trivittatus)

• を以てをもって

  with, by, by means of

• 中以上ちゅういじょう

  above average

• 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

• 以夷制夷いいせいい

  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

• 以ての外もってのほか

  outrageous, preposterous, most improper, most unreasonable, inexcusable, unpardonable, out of the question

• 以心伝心いしんでんしん

  telepathy, tacit understanding, thought transference, communion of mind with mind

• 実力以上じつりょくいじょう

  beyond oneself, beyond one's ability, exceeding one's power

• それ以来それいらい

  since then, from that time, ever since

• 甚だ以てはなはだもって

  exceedingly

• 有史以来ゆうしいらい

  since the dawn of history

• あれ以来あれいらい

  since then

• 一別以来いちべついらい

  since our last meeting, since we parted

• 標準以下ひょうじゅんいか

  below average

• 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

• 開闢以来かいびゃくいらい

  since the beginning of the world, since the dawn of history

• 有史以前ゆうしいぜん

  prehistory

• ゼロ以外ゼロいがい

  non-zero

• 整数以外せいすういがい

  non-integer

• 未生以前みしょういぜん

  before one's birth, before one was born

• 数分以内すうふんいない

  within minutes

• 友達以上ともだちいじょう

  more than a friend (implies a degree of intimacy)

• それ以上それいじょう

  further, above (that), greater (than that), any more