[syn: solidity, solidness]
The Collaborative International Dictionary of English v.0.48:
Solidness \Sol"id*ness\, n.
   1. State or quality of being solid; firmness; compactness;
      solidity, as of material bodies.
      [1913 Webster]
   2. Soundness; strength; truth; validity, as of arguments,
      reasons, principles, and the like.
      [1913 Webster]
WordNet (r) 3.0 (2006):
solidness
    n 1: the state in which a substance has no tendency to flow
         under moderate stress; resists forces (such as compression)
         that tend to deform it; and retains a definite size and
         shape [syn: solid, solidness, solid state]
    2: the consistency of a solid [syn: solidity, solidness]
       [ant: porosity, porousness]
    3: the quality of being substantial or having substance [syn:
       substantiality, substantialness, solidness] [ant:
       insubstantiality]
    4: the quality of being solid and reliable financially or
       factually or morally; "the solidity of the evidence worked in
       his favor"; "the solidness of her faith gave her enduring
       hope" [syn: solidity, solidness]