This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
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adj. Of, pertaining to, or composed of factions.

Of, pertaining to, or characterized by faction: as, factional resentment; factional perversity.

"Electable bodies such as Anglesey Council abrogate much of their power to people who act as monarchs, and then waste much of their time and efforts in factional infighting."

fractional   

internecine    intertribal    jurisdictional    dynastic    sectional    sectarian    hand-to-hand    generational    rancorous    long-standing