1. A final, conclusive farewell that signals the permanent end of a relationship, connection, or situation with no intention of return or reconciliation
After years of trying to make it work, they exchanged a definitive goodbye and never spoke again.
Depois de anos tentando fazer funcionar, trocaram um adeus definitivo e nunca mais falaram.
2. An irreversible parting that marks a complete and lasting separation
Saying a definitive goodbye to her old life was both painful and liberating.
Dizer um adeus definitivo à sua vida antiga foi tanto doloroso quanto libertador.