This is the 4838th most frequent Spanish word.
decisiva
"Decisiva" means "decisive" or "crucial."
Here, "decisiva" is used as an adjective describing "la participación de Elena," indicating that her role played a determining role in the outcome of the championship.
La participación de Elena fue decisiva para ganar el campeonato.
Elena's participation was decisive in winning the championship.
In this case, "decisiva" modifies "acción," highlighting the resolution and impact of the action taken.
Tomaron una acción decisiva frente a los desafíos económicos.
They took a decisive action in face of the economic challenges.
"Decisiva" is utilized here to qualify "la evidencia presentada," underlining the importance of the evidence in determining the final decision.