There are many other ways to express aiki, so if you look at it that way, then Aikido would be only "a way to express aiki."
I'd say that it's more "the way to transcendence, through the practice and refinement of aiki." Aiki as The Way (to Enlightenment). So, "The Way of Aiki."
Cady, you hit the mark.
Dan Harden wrote in the above mentioned post about Ueshiba's aikido:
"That said, it was never the peacnick model of avoiding power and running away from force. His constant admonitions were of possessing power as a killing force and then having to forge ones soul to manage it's use and that practice and hone that control. An old saying goes "If I raise my hand. I withdraw my temper. If i raise my temper, I withdraw my hand."
There is a conundrum to Aikido and really many high level arts, that can feed us for the rest of our lives."
That's in a way "transcending" and a place where certainly many more of us would want to go, if it only were an easier path to follow.