Source : Webster's Revised Unabridged Dictionary (1913)

Superlative \Su`per*la"tive\, a. [L. superlativus, fr.
   superlatus excessive, used as p. p. of superiorferre, but
   from a different root: cf. F. superlatif. See {Elate},
   {Tolerate}.]
   1. Lifted up to the highest degree; most eminent; surpassing
      all other; supreme; as, superlative wisdom or prudence; a
      woman of superlative beauty; the superlative glory of the
      divine character.

   2. (Gram.) Expressing the highest or lowest degree of the
      quality, manner, etc., denoted by an adjective or an
      adverb. The superlative degree is formed from the positive
      by the use of -est, most, or least; as, highest, most
      pleasant, least bright. -- {Su`per*la"tive*ly}, adv. --
      {Su`per*la"tive*ness}, n.

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

   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.

Source : WordNet®

superlative
     n 1: an exaggerated expression (usually of praise); "the critics
          lavished superlatives on it"
     2: the highest level or degree attainable; "his landscapes were
        deemed the acme of beauty"; "the artist's gifts are at
        their acme"; "at the height of her career"; "the peak of
        perfection"; "summer was at its peak"; "...catapulted
        Einstein to the pinnacle of fame"; "the summit of his
        ambition"; "so many highest superlatives achieved by man";
        "at the top of his profession" [syn: {acme}, {height}, {elevation},
         {peak}, {pinnacle}, {summit}, {top}]
     3: the superlative form of an adjective; "`best' is the
        superlative form of `good'"

superlative
     adj : highest in quality [syn: {greatest}, {sterling(a)}]