[vis.i.bil.i.ty] n, pl -ties (1581) 1: the quality or state of being visible
2. a: the degree of clearness of the atmosphere; specif: the greatest distance toward the horizon at which prominent objects can be identified with the naked eye b: capability of being readily noticed c: capability of affording an unobstructed view d: publicity 2d
3: a measure of the ability of radiant energy to evoke visual sensation