Decisivo vs. determinante
While both decisivo and determinante are used to describe something that settles an issue or is crucial to an outcome, they carry subtle differences in focus. Generally, decisivo refers to the finality or the turning point that concludes a situation, while determinante refers to the underlying cause or influence that shapes the result.
Decisivo
B1This word describes an action, moment, or event that brings a situation to a close, settles a doubt, or produces a final result. It focuses on the resolution of uncertainty or the tipping point.
O gol decisivo foi marcado nos últimos segundos da partida.
(The decisive goal was scored in the last seconds of the match.)
Amanhã teremos uma reunião decisiva para o futuro da empresa.
(Tomorrow we will have a decisive meeting regarding the future of the company.)
Aquela batalha foi decisiva para o encerramento da guerra.
(That battle was decisive for the end of the war.)
Foi um passo decisivo na carreira dela.
(It was a decisive step in her career.)
O tribunal tomou a medida decisiva para resolver o caso.
(The court took the decisive measure to resolve the case.)
Determinante
B2This word describes a factor, condition, or cause that exerts a controlling influence over the nature of an outcome. It focuses on why or how a result was achieved rather than just the moment it ended.
A boa alimentação é um fator determinante para a saúde.
(Good nutrition is a determining factor for health.)
O apoio dos seus pais foi determinante para o seu sucesso.
(His parents' support was determining for his success.)
A chuva foi determinante para o cancelamento do evento.
(The rain was the determining factor for the cancellation of the event.)
A velocidade de reação foi determinante neste teste.
(Reaction speed was the determining element in this test.)
Sua atitude positiva foi determinante para conseguir o emprego.
(Your positive attitude was determining in getting the job.)
Summary
In essence, use decisivo when highlighting the moment or act that ends a conflict or uncertainty (the final blow). Use determinante when highlighting the specific influence or cause that made the result inevitable (the root cause).