The Collaborative International Dictionary of English v.0.48:

Reflective \Re*flect"ive\ (r?*fl?kt"?v), a. [Cf. F.
   r['e]flectif. Cf. Reflexive.]
   1. Throwing back images; as, a reflective mirror.
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            In the reflective stream the sighing bride, viewing
            her charms.                           --Prior.
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   2. Capable of exercising thought or judgment; as, reflective
      reason. --Prior.
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            His perceptive and reflective faculties . . . thus
            acquired a precocious and extraordinary development.
                                                  --Motley.
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   3. Addicted to introspective or meditative habits; as, a
      reflective person.
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   4. (Gram.) Reflexive; reciprocal.
      [1913 Webster] -- Re*flect"ive*ly, adv. --
      Re*flect"ive*ness, n. "Reflectiveness of manner." --J.
      C. Shairp.
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WordNet (r) 3.0 (2006):

reflectiveness
    n 1: the capability of quiet thought or contemplation [syn:
         reflectiveness, reflectivity]