noun.
The power or ability to generate an outcome.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the susceptibility of something to a particular treatment
noun.
an aptitude that may be developed
noun.
the quality of being capable -- physically or intellectually or legally
Word Usage
"The end of negative capability is to create something beyond one's usual or conscious (affirmative?) capability like that splendid Satan whose star of morning so outshines God's sun and son."