The Collaborative International Dictionary of English v.0.48:

Popularize \Pop"u*lar*ize\, v. t. [imp. & p. p. Popularized;
   p. pr. & vb. n. Popularizing.] [Cf. F. populariser.]
   To make popular; to make suitable or acceptable to the common
   people; to make generally known; as, to popularize
   philosophy. "The popularizing of religious teaching."
   --Milman.
   [1913 Webster]