Noah Webster
Adversary
AD'VERSARY, noun [See Adverse.]
1. An enemy or foe; one who has enmity at heart.
The Lord shall take vengeance on his adversaries. Nahum 1.
In scripture, Satan is called THE adversary by way of eminence. 1 Peter 5:8.
2. An opponent or antagonist, as in a suit at law, or in single combat; an opposing litigant.
AD'VERSARY, adjective Opposed; opposite to; adverse. In law, having an opposing party, as an adversary suit; in distinction from an application, in law or equity, to which no opposition is made.