deciding a matter finally, or relating to the process of doing this

No single factor is ordinarily dispositive. 通常没有任何一个因素具有决定性的意义。

The surveyor left off the original boundary lines, and that proved to be the dispositive fact in this appeal. 勘测员把原来的边界线划掉了，而事实证明，这是本上诉案中的决定性事实。