과거의 특정 시점부터 효력이 발생하도록 거슬러 올라가서
with effect from a date in the past, especially regarding laws, rules, or payments
예문:
"The government announced that the tax cuts would be applied retroactively to the previous fiscal year."
"The court ruled that the new law could not be applied retroactively to cases already settled."
"They received a salary increase that was calculated retroactively from January."