1. A genuine, truthful, and reliable account or clarification of something that is based on original sources or firsthand knowledge
The historian provided an authentic explanation of the ancient manuscript's origins.
O historiador forneceu uma explicação autêntica sobre as origens do manuscrito antigo.
2. A credible and verifiable interpretation that is not fabricated, distorted, or secondhand
We need an authentic explanation for the discrepancies in the financial report.
Precisamos de uma explicação autêntica para as discrepâncias no relatório financeiro.