1. A change or adjustment made to an agreement, law, or system that applies retroactively to a period before the modification was made
The company implemented a backward-looking modification to the contract that affected all previous transactions.
A empresa implementou uma modificação retroativa do contrato que afetou todas as transações anteriores.
2. In legal and regulatory contexts, an alteration that takes effect from a date prior to its official implementation
The tax authority issued a backward-looking modification to the billing procedures effective from January 1st.
A autoridade fiscal emitiu uma modificação retroativa dos procedimentos de faturamento com vigência a partir de 1º de janeiro.