from
The Collaborative International Dictionary of English v.0.48
Mediatize \Me"di*a*tize\, v. t. [imp. & p. p. {Mediatized}; p.
pr. & vb. n. {Mediatizing}.] [Cf. F. m['e]diatiser.]
To cause to act through an agent or to hold a subordinate
position; to annex; -- specifically applied to the annexation
during the former German empire of a smaller German state to
a larger, while allowing it a nominal sovereignty, and its
prince his rank.
[1913 Webster]
The misfortune of being a mediatized prince.
--Beaconsfield.
[1913 Webster]