The Collaborative International Dictionary of English v.0.48:
Comprehensibility \Com`pre*hen`si*bil"i*ty\, n. The quality or state of being comprehensible; capability of being understood. [1913 Webster]WordNet (r) 3.0 (2006):
comprehensibility n 1: the quality of comprehensible language or thought [syn: comprehensibility, understandability] [ant: incomprehensibility]