The Collaborative International Dictionary of English v.0.48:
Enemy \En"e*my\, n.; pl. Enemies. [OF. enemi, F. ennemi, from
L. inimicus; in- (negative) + amicus friend. See Amicable.]
One hostile to another; one who hates, and desires or
attempts the injury of, another; a foe; an adversary; as, an
enemy of or to a person; an enemy to truth, or to falsehood.
To all good he enemy was still. --Spenser.
I say unto you, Love your enemies. --Matt. v. 44.
The enemy (Mil.), the hostile force. In this sense it is
construed with the verb and pronoun either in the singular
or the plural, but more commonly in the singular; as, we
have met the enemy and he is ours or they are ours.
It was difficult in such a country to track the
enemy. It was impossible to drive him to bay.
Syn: Foe; antagonist; opponent. See Adversary.