noun, plural enemies.
a person who feels hatred for, fosters harmful designs against, or engages in antagonistic activities against another; an adversary or opponent.
an armed foe; an opposing military force: The army attacked the enemy at dawn.
a hostile nation or state.
a citizen of such a state.
enemies, persons, nations, etc., that are hostile to one another: Let's make up and stop being enemies.
something harmful or prejudicial: His unbridled ambition is his worst enemy.
the Enemy, the Devil; Satan.
belonging to a hostile power or to any of its nationals: enemy property.
Obsolete. inimical; ill-disposed.

1250–1300; Middle English enemi < Anglo-French, Old French < Latin inimicus unfriendly, equivalent to in- in-3 + amicus friendly, friend; see amicable

nonenemy, noun, plural nonenemies.

1. antagonist. Enemy, foe refer to a dangerous public or personal adversary. Enemy emphasizes the idea of hostility: to overcome the enemy; a bitter enemy. Foe, a more literary word, may be used interchangeably with enemy, but emphasizes somewhat more the danger to be feared from such a one: deadly foe; arch foe of humankind (the Devil ).

1. friend. 2. ally.

See collective noun.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
enemy (ˈɛnəmɪ)
n , pl -mies
1.  a person hostile or opposed to a policy, cause, person, or group, esp one who actively tries to do damage; opponent
2.  a.  an armed adversary; opposing military force
 b.  (as modifier): enemy aircraft
3.  a.  a hostile nation or people
 b.  (as modifier): an enemy alien
4.  something that harms or opposes; adversary: courage is the enemy of failure
Related: inimical
[C13: from Old French enemi, from Latin inimīcus hostile, from in-1 + amīcus friend]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., from O.Fr. enemi, from L. inimicus, from in- "not" + amicus "friend." Most words for "personal enemy" cover also "enemy in war," but certain languages have special terms for the latter, e.g. Gk. polemioi (distinct from ekhthroi), L. hostis, originally "stranger" (distinct from inimicus),
Rus. neprijatel' (distinct from vrag). Rus. vrag (O.C.S. vragu) is cognate with Lith. vargas "misery" (see urge), and probably is related to P.Gmc. *wargoz, source of O.N. vargr "outlaw," hence "wolf;" Icel. vargur "fox," O.E. wearg "criminal, felon;" which likely were the inspirations for J.R.R. Tolkien's warg "a kind of large ferocious wolf" in "The Hobbit" (1937) and "Lord of the Rings." Related: Enemies.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Caricaturing your enemy as a psychopath simply ensures that you will never
  defeat him.
The enemy of our enemy may be our new partner in stopping a global health
Concrete and steel are the materials of choice when building buildings and
  vehicles that will protect soldiers from enemy fire.
If the enemy was scaling the walls, soldiers could drop rocks or boiling oil
  down through the holes and onto the enemy below.
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