1.
since, ever since
From a specific point in the past until now.
卒業以来、会っていない。
I haven't seen them since graduation.
去年以来のことだ。
It's the first time since last year.
子供の頃以来だ。
It's the first time since I was a child.
結婚以来、幸せです。
I've been happy since getting married.
会って以来、ずっと友達だ。
We've been friends ever since we met.
入社以来10年になる。
It's been 10 years since I joined the company.
事故以来、車を運転していない。
I haven't driven since the accident.
2.
from now on, henceforth
From this point forward.
今日以来、禁煙します。
From today onwards, I'll quit smoking.
これ以来、注意するようにしている。
From then on, I've been careful.
今以来、連絡を取り合おう。
Let's keep in touch from now on.
この失敗以来、もっと慎重に行動するようになった。
Since this failure, I've started acting more carefully.
先月以来、毎日運動を続けている。
Since last month, I've been exercising every day.
以来 indicates "since" a specific time.
COMMON PATTERNS:
- X以来 (since X)
- 〜て以来 (since doing ~)
- 以来ずっと (ever since then)
SIMILAR WORDS:
- 以来: since (continuing until now)
- 以後: after, from then on (forward-looking)
- 以降: from ~ onward (often written)
NOTE:
- Different from 依頼 (request) - same reading, different kanji