决定的名词是decision。decision的例句：I don't want to make the wrong decision and regret it later（我不想作出错误的决定，其后再来后悔）。

decision的例句：The president said he'd made no firm decision on whether he would run for a second term in office（总统说他还没有下定决心是否竞选连任）；He is very much a man of decision and action（他是一个遇事非常果断、行动极为迅速的人）。