Of action, speech, etc.: relating to or proceeding from conflict or dispute between factions; characterized by dissent or partisanship.

That takes another's part or side. Obsolete. rare.

Allied to one side or another in a conflict or debate; divided into factions or parties. Cf. side, v.1 II. Obsolete.

Taking part in dissent or a quarrel; active as a factionalist. Obsolete.

Characterized by faction, dissent, or the taking of sides; factious, partisan. Obsolete. rare.

Of or relating to a faction or factions; characterized by dissent or faction.

Partisan; imbued with party spirit. Now esp.: in keeping with the ideology of a political party. rare before 20th cent.

That blindly or zealously supports a cause or party.

gen. Of, relating to, or characteristic of a partisan; supporting a cause, party, or person, esp. zealously or blindly; one-sided, prejudiced.