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.