The Collaborative International Dictionary of English v.0.48:

Conspicuous \Con*spic"u*ous\, a. [L. conspicuus, fr. conspicere
   to get sight of, to perceive; con- + spicere, specere, to
   look. See Spy]
   1. Open to the view; obvious to the eye; easy to be seen;
      plainly visible; manifest; attracting the eye.
      [1913 Webster]

            It was a rock
            Of alabaster, piled up to the clouds,
            Conspicious far.                      --Milton.
      [1913 Webster]

            Conspicious by her veil and hood,
            Signing the cross, the abbess stood.  --Sir W.
                                                  Scott.
      [1913 Webster]

   2. Obvious to the mental eye; easily recognized; clearly
      defined; notable; prominent; eminent; distinguished; as, a
      conspicuous excellence, or fault.
      [1913 Webster]

            A man who holds a conspicuous place in the
            political, ecclesiastical, and literary history of
            England.                              --Macaulay.

   Syn: Distinguished; eminent; famous; illustrious; prominent;
        celebrated. See Distinguished. -- Con*spic"u*ous*ly,
        adv. -- Con*spic"u*ous*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

conspicuousness
    n 1: the state of being conspicuous
    2: high visibility [ant: inconspicuousness]