The Collaborative International Dictionary of English v.0.48:

Unconditioned \Un`con*di"tioned\, a.
   1. Not conditioned or subject to conditions; unconditional.
      [1913 Webster]

   2. (Metaph.) Not subject to conditions or limitations;
      infinite; absolute; hence, inconceivable; incogitable.
      --Sir W. Hamilton.
      [1913 Webster]

   The unconditioned (Metaph.), all that which is
      inconceivable and beyond the realm of reason; whatever is
      inconceivable under logical forms or relations.
      [1913 Webster]