以後(いご)

いご
adverb
after this, from now on, hereafter
1. after this, from now on
From this point forward in time.
以後(いご)気(き)をつけます。
I'll be careful from now on.
以後(いご)このようなことがないようにします。
I will make sure this doesn't happen again.
以後(いご)注意(ちゅうい)してください。
Please be careful from now on.
2. after (a specific time/event)
Following a specified point in time or event.
3時(じ)以後(いご)は会議(かいぎ)があります。
I have a meeting after 3 o'clock.
卒業(そつぎょう)以後(いご)、会(あ)っていない。
I haven't seen them since graduation.
4月(がつ)以後(いご)に連絡(れんらく)します。
I'll contact you after April.

以後(いご) means "after" a point in time, or "from now on" when used without a preceding time reference. The boundary point itself may or may not be included.

USAGE:

  • Standalone: 以後(いご)気(き)をつけます (I'll be careful from now on)
  • After time/event: 3時(じ)以後(いご) (after 3 o'clock), 卒業(そつぎょう)以後(いご) (after graduation)

SIMILAR WORDS:

  • 以後(いご): after, from now on (slightly formal)
  • 以来(いらい): since, ever since (emphasizes continuation from that point)
  • 以降(いこう): from ~ onward (common in written/official contexts, includes the boundary)
  • これから: from now (conversational, neutral)

REGISTER:
Somewhat formal. In casual speech, これから or ～から後(あと) is more natural for "from now on." 以後(いご) often appears in apologies, warnings, or official instructions.

general
Added 2026.1.9 20:57 · Revised 2026.3.30 12:20
01500/01710_igo