ADJECTIVE (3)

1. expressible as a quantity or relating to or susceptible of measurement;
- Example: "export wheat without quantitative limitations"
- Example: "quantitative analysis determines the amounts and proportions of the chemical constituents of a substance or mixture"

2. relating to the measurement of quantity;
- Example: "quantitative studies"

3. (of verse) having a metric system based on relative duration of syllables;
- Example: "in typical Greek and Latin verse of the classical period the rhymic system is based on some arrangement of long and short elements"

The Collaborative International Dictionary of English v.0.48:

Quantitative \Quan"ti*ta*tive\, a. [Cf. F. quantitatif.]
   Relating to quantity. -- Quan"ti*ta*tive*ly, adv.
   [1913 Webster]

   Quantitative analysis (Chem.), analysis which determines
      the amount or quantity of each ingredient of a substance,
      by weight or by volume; -- contrasted with qualitative
      analysis.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Analysis \A*nal"y*sis\, n.; pl. Analyses. [Gr. ?, fr. ? to
   unloose, to dissolve, to resolve into its elements; ? up + ?
   to loose. See Loose.]
   1. A resolution of anything, whether an object of the senses
      or of the intellect, into its constituent or original
      elements; an examination of the component parts of a
      subject, each separately, as the words which compose a
      sentence, the tones of a tune, or the simple propositions
      which enter into an argument. It is opposed to
      synthesis.
      [1913 Webster]

   2. (Chem.) The separation of a compound substance, by
      chemical processes, into its constituents, with a view to
      ascertain either (a) what elements it contains, or (b) how
      much of each element is present. The former is called
      qualitative, and the latter quantitative analysis.
      [1913 Webster]

   3. (Logic) The tracing of things to their source, and the
      resolving of knowledge into its original principles.
      [1913 Webster]

   4. (Math.) The resolving of problems by reducing the
      conditions that are in them to equations.
      [1913 Webster]

   5.
      (a) A syllabus, or table of the principal heads of a
          discourse, disposed in their natural order.
      (b) A brief, methodical illustration of the principles of
          a science. In this sense it is nearly synonymous with
          synopsis.
          [1913 Webster]

   6. (Nat. Hist.) The process of ascertaining the name of a
      species, or its place in a system of classification, by
      means of an analytical table or key.
      [1913 Webster]

   Ultimate, Proximate, Qualitative, Quantitative, and
   Volumetric analysis. (Chem.) See under Ultimate,
      Proximate, Qualitative, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

quantitative
    adj 1: expressible as a quantity or relating to or susceptible
           of measurement; "export wheat without quantitative
           limitations"; "quantitative analysis determines the
           amounts and proportions of the chemical constituents of a
           substance or mixture" [ant: qualitative]
    2: relating to the measurement of quantity; "quantitative
       studies"
    3: (of verse) having a metric system based on relative duration
       of syllables; "in typical Greek and Latin verse of the
       classical period the rhymic system is based on some
       arrangement of long and short elements" [ant: accentual,
       syllabic]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "quantitative":
   a, an, any, approximative, certain, chorographic, estimative,
   hypsographic, measured, measuring, mensural, mensurational,
   mensurative, metric, numerative, oceanographic, one, quantified,
   quantitive, quantized, some, topographic, valuational, valuative