n. The characteristic of being conceivable; the ability to be conceived, believed, or understood.
The Century Dictionary and Cyclopedia
n. Capability of conveying a meaning; capability of being supposed without self-contradiction or contradiction of something firmly believed; imaginability.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the state of being conceivable
Word Usage
"I include (2) because the notion of conceivability has one foot in the psychological camp, like imaginability, and one in the camp of pure logical possibility and therefore helps in the transition from one to the other."