This is the 2848th most frequent Catalan word.
decisiva
"Decisiva" in Catalan means "decisive" in English.
In this sentence, 'decisiva' is used as an adjective modifying 'participació' to describe the crucial role it played in achieving the victory.
La seva participació va ser decisiva per a la victòria.
Her participation was decisive for the victory.
Here, 'decisiu/decisiva' conveys the importance of the match in making a significant outcome — deciding the champion.
El partit d'avui serà decisiu per determinar el campió.
Today's match will be decisive in determining the champion.
In this usage, 'decisiva' characterizes the decision as having substantial weight or finality in influencing future actions.