The Collaborative International Dictionary of English v.0.48:

Popularization \Pop`u*lar*i*za"tion\, n.
   The act of making popular, or of introducing among the
   people.
   [1913 Webster]

WordNet (r) 3.0 (2006):

popularization
    n 1: an interpretation that easily understandable and acceptable
         [syn: popularization, popularisation]
    2: the act of making something attractive to the general public
       [syn: popularization, popularisation, vulgarization,
       vulgarisation]