The Collaborative International Dictionary of English v.0.48:

Tangible \Tan"gi*ble\, a. [L. tangibilis, fr. tangere to touch:
   cf. F. tangible. See Tangent.]
   1. Perceptible to the touch; tactile; palpable. --Bacon.
      [1913 Webster]

   2. Capable of being possessed or realized; readily
      apprehensible by the mind; real; substantial; evident. "A
      tangible blunder." --Byron.
      [1913 Webster]

            Direct and tangible benefit to ourselves and others.
                                                  --Southey.
      [1913 Webster] -- Tan"gi*ble*ness, n. -- Tan"gi*bly,
      adv.
      [1913 Webster]

WordNet (r) 3.0 (2006):

tangibleness
    n 1: the quality of being perceivable by touch [syn:
         tangibility, tangibleness, palpability] [ant:
         impalpability, intangibility, intangibleness]