The phrase "a decisive voice" is correct and usable in written English.
It can be used to refer to someone whose opinion or input has a significant impact on a decision or outcome.
Example: "In the meeting, her perspective was valued, and she became a decisive voice in the final decision-making process."
Alternatives: "an influential voice" or "a key voice".
The notion that "victims" should have a decisive voice at this stage of the debate is mere sentimentality.
The conservatives would prefer to see a conservative umbrella group, the Islamic Coalition Society, have a decisive voice in Parliament.
Republican activists still back the president on Iraq, but independent voters side with the Democrats, and often have a decisive voice.
Moreover, I understand that there have been reactions against the fact that a European institution could have such a decisive voice in this matter.
Wherever you turn, whether in the factory, the newspaper, the farm or the university, the party secretary retains a decisive voice.
Pugh said: "To change the status of a school without allowing the parents at the school a decisive voice is extraordinarily hard to justify".
"When war, like the one now in Iraq, threatens the fate of humanity, it is even more urgent for us to proclaim, with a firm and decisive voice, that only peace is the way of building a more just and caring society," he said in a speech to employees of Telepace, a Roman Catholic television station.
To make a clear and decisive voice in the crowded space, marketers must align themselves with latest trends in the market.
That question has now become much more complex as a result of the deal the Conservatives have struck with the DUP, who will have a much more decisive voice in any negotiations about how the border will be implemented.
At their head stood the mobedān mobed ("priest of priests"), who, in addition to his purely religious jurisdiction, appears, especially in later times, to have had a more or less decisive voice in the choice of a successor to the throne and in other matters of state.
But in each one of those cases, before Gorbachev made his decision Shevardnadze was an important, if not decisive voice, in the internal debates, urging what were from our point of view the most progressive policies". Mr. Gorbachev, the official added, had a daring but often abstract vision of how the Soviet Union should relate to world affairs.
