The Collaborative International Dictionary of English v.0.48:

Categorical \Cat`e*gor"ic*al\, a.
   1. Of or pertaining to a category.
      [1913 Webster]

   2. Not hypothetical or relative; admitting no conditions or
      exceptions; declarative; absolute; positive; express; as,
      a categorical proposition, or answer.
      [1913 Webster]

            The scriptures by a multitude of categorical and
            intelligible decisions . . . distinguish between the
            things seen and temporal and those that are unseen
            and eternal. --I. Taylor.
      [1913 Webster]

WordNet (r) 3.0 (2006):

categorical
    adj 1: relating to or included in a category or categories [syn:
           categorical, categoric]
    2: not modified or restricted by reservations; "a categorical
       denial"; "a flat refusal" [syn: categoric, categorical,
       flat, unconditional]