Finality is the absolute, definite end. People often speak of the finality of death — nothing comes after it and nothing that came before it can be changed.
If someone speaks with absolute finality, he is not going to change his mind. The sound of a judge's gavel slamming down gives a sense of finality to his or her judgment. Because of its association with death and closure, finality often carries a somber undertone. It can also be used in conjunction with the end of a sports season. But even the finality of the seventh game of a classic World Series is usually forgotten by the time spring training rolls around.