Source : Webster's Revised Unabridged Dictionary (1913)

Visible \Vis"i*ble\, a. [L. visibilis, fr. videre, visum, to
   see: cf. F. visible. See {Vision}.]
   1. Perceivable by the eye; capable of being seen;
      perceptible; in view; as, a visible star; the least spot
      is visible on white paper.

            Maker of heaven and earth, and of all things visible
            and invisible.                        --Bk. of Com.
                                                  Prayer.

            Virtue made visible in outward grace. --Young.

   2. Noticeable; apparent; open; conspicuous. --Shak.

            The factions at court were greater, or more visible,
            than before.                          --Clarendon.

   {Visible church} (Theol.), the apparent church of Christ on
      earth; the whole body of professed believers in Christ, as
      contradistinguished from the invisible, or real, church,
      consisting of sanctified persons.

   {Visible horizon}. Same as {Apparent horizon}, under
      {Apparent}. -- {Vis"i*ble*ness}, n. -- {Vis"i*bly}, adv.

Source : WordNet®

visibleness
     n : quality or fact or degree of being visible; perceptible by
         the eye or obvious to the eye; "low visibility caused by
         fog" [syn: {visibility}] [ant: {invisibility}]