Source : Webster's Revised Unabridged Dictionary (1913)

Visibility \Vis`i*bil"i*ty\, n. [L. visibilitas: cf. F.
   visibilit['e].]
   The quality or state of being visible.

Source : WordNet®

visibility
     n 1: quality or fact or degree of being visible; perceptible by
          the eye or obvious to the eye; "low visibility caused by
          fog" [syn: {visibleness}] [ant: {invisibility}]
     2: degree of exposure to public notice; "that candidate does
        not have sufficient visibility to win an election"; "he
        prefers a low profile" [syn: {profile}]
     3: capability of providing a clear unobstructed view; "a
        windshield with good visibility"