Webster’s Revised Unabridged Dictionary · 1913
Factionary
Fac′tion·a·ry (·ā·ry̆), a. [Cf. F. factionnaire, L. factionarius the head of a company of charioteers.] Belonging to a faction; being a partisan; taking sides. [Obs.]
Always factionary on the party of your general. Shak.