What is "plebification"

Plebification \Pleb`i*fi*ca"tion\, n. [L. plebs the common people + -ficare (in comp.) to make. See -fy.] A rendering plebeian; the act of vulgarizing. [R.]

You begin with the attempt to popularize learning . . . but you will end in the plebification of knowledge.
--Coleridge.

n. Making plebeian; vulgarize.