me·di·a·tize 
(m
ēd
ē-
ə-t
īz
′)
tr.v. me·di·a·tized,
me·di·a·tiz·ing,
me·di·a·tiz·es To annex (a lesser state) to a greater state as a means of permitting the ruler of the lesser state to retain title and partial authority.
[Probably French médiatiser, from médiat, dependent, from Old French, back-formation from immediat, independent, from Late Latin immediātus; see IMMEDIATE.]
me′di·a·ti·zation (-tĭ-zāshən) n.