How do you spell Adversary

Available Definitions:
1)  n. - One who is turned against another or others with a design to oppose or resist them; a member of an opposing or hostile party; an opponent; an antagonist; an enemy; a foe.
2)  a. - Opposed; opposite; adverse; antagonistic.
3)  a. - Having an opposing party; not unopposed; as, an adversary suit.