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The Collaborative International Dictionary
Factionary

Factionary \Fac"tion*a*ry\, a. [Cf. F. factionnaire, L. factionarius the head of a company of charioteers.] Belonging to a faction; being a partisan; taking sides.

Always factionary on the party of your general.
--Shak.

Wiktionary
factionary

a. (context obsolete English) Belonging to a faction; partisan; taking sides.