n. The character of being powerful; force; power; might; potency; efficacy.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. possession of controlling influence
Word Usage
"The "powerfulness" of the ending would be incredible if they chose to do that: no Edward throughout the beginning of the movie, but in the end he returns. (well Bella finds him, but you get the point)"