The Collaborative International Dictionary of English v.0.48:

Superlative \Su`per*la"tive\, n.
   1. That which is highest or most eminent; the utmost degree.
      [1913 Webster]

   2. (Gram.)
      (a) The superlative degree of adjectives and adverbs;
          also, a form or word by which the superlative degree
          is expressed; as, strongest, wisest, most stormy,
          least windy, are all superlatives.
          [1913 Webster]

   Absolute superlative, a superlative in an absolute rather
      than in a comparative or exclusive sense. See Elative.
      [1913 Webster]