What is the meaning of enemy?

noun

• An opposing military force.
  • usage: "the enemy attacked at dawn"
• An armed adversary (especially a member of an opposing military force. )
  • usage: "a soldier must be prepared to kill his enemies"
  • synonyms: foe, foeman, opposition
• Any hostile group of people.
  • usage: "he viewed lawyers as the real enemy"
• A personal enemy.
  • usage: "they had been political foes for years"
  • synonyms: foe