[1] : The Collaborative International Dictionary of English v.0.48

alien \al"ien\, a. of. alien, l. alienus, fr. alius another;
   properly, therefore, belonging to another. see else.
   1. not belonging to the same country, land, or government, or
      to the citizens or subjects thereof; foreign; as, alien
      subjects, enemies, property, shores.
      1913 webster

   2. wholly different in nature; foreign; adverse; inconsistent
      with; incongruous; -- followed by from or sometimes by
      to; as, principles alien from our religion.
      1913 webster

            an alien sound of melancholy.         --wordsworth.
      1913 webster

   alien enemy law, one who owes allegiance to a government
      at war with ours. --abbott.
      1913 webster
see also:
else alien enemy 

Enemy >> E Words
Enemy, definition of term: Enemy
enemy_pag1.html

Alien >> A Words
Alien, definition of term: Alien
alien_pag1.html