The Collaborative International Dictionary of English v.0.48:

Metrification \Met`ri*fi*ca"tion\, n.
   1. Composition in metrical form; versification. [R.]
      --Tennyson.
      [1913 Webster]

   2. The act or process of converting the standard system of
      units of a country to those of the metric system;
      metrication.
      [PJC]

WordNet (r) 3.0 (2006):

metrification
    n 1: writing a metrical composition (or the metrical structure
         of a composition)
    2: the act of changing from imperial units of measurement to
       metric units: meters, grams, seconds [syn: metrification,
       metrication]