Being Retroactive
Retroactivity
noun, verbal noun
Go upstream through the currents of time to reach something in the past — this is called being retroactive.
遡及 is a formal, technical word used when something is applied retroactively. You'll mostly see it in legal or administrative contexts when discussing rules or effects that are being applied to past actions or situations.
This is a jukugo word that uses the on'yomi readings of the kanji. You know these readings — no need to retroactively learn any new readings for old kanji here.
遡及適用
retroactive application
遡及請求
retroactive claim
遡及的
retroactive
年金の遡及請求について説明を受けました。
I received an explanation about retroactive pension claims.
この法律は過年度へ遡及適用されることはありません。
This law will not be applied retroactively to past fiscal years.
給与規定の改定は、非遡及的なものになる予定です。
The revision of the salary regulations is expected to be non-retroactive.
当時は気づかなかった小さな言葉や視線が、今になって意味を持ち、静かだった彼の心を遡及的な怒りが焼きつくしていった。
Small words and glances he hadn't noticed at the time now took on meaning, and a retroactive anger burned away his once-quiet heart.