1. A modification or change to a law, contract, or agreement that applies to events or situations that occurred before the amendment was made
The retroactive amendment to the tax law affected all transactions from the previous fiscal year.
A emenda retroativa à lei fiscal afetou todas as transações do ano fiscal anterior.
2. A legal alteration that has effect from a date in the past, not just from the date of its enactment
Congress passed a retroactive amendment to provide benefits to veterans dating back five years.
O Congresso aprovou uma emenda retroativa para fornecer benefícios aos veteranos com efeito retroativo de cinco anos.