The Collaborative International Dictionary of English v.0.48:

Quantification \Quan`ti*fi*ca"tion\, n. [See Quantity.]
   Modification by a reference to quantity; the introduction of
   the element of quantity.
   [1913 Webster]

         The quantification of the predicate belongs in part to
         Sir William Hamilton; viz., in its extension to
         negative propositions.                   --De Quincey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

quantification
    n 1: a limitation imposed on the variables of a proposition (as
         by the quantifiers `some' or `all' or `no')
    2: the act of discovering or expressing the quantity of
       something

Moby Thesaurus II by Grady Ward, 1.0:

40 Moby Thesaurus words for "quantification":
   accounting, appraisal, appraisement, approximation, assessment,
   assize, assizement, calculation, census, computation, correction,
   counting, dactylonomy, determination, enumeration, estimate,
   estimation, evaluation, foliation, gauging, instrumentation,
   inventorying, measure, measurement, measuring, mensuration,
   metric system, numbering, numeration, pagination, quantization,
   rating, survey, surveying, tallying, telemetering, telemetry,
   telling, triangulation, valuation