• (obsolete, uncountable) Instruments of war.
  • (countable) A particular conflict of this kind.
  • (figuratively) A campaign against something.

    "The "war on terror" is a campaign against terrorist crime."

  • (business, countable) A bout of fierce competition in trade.

    "The cellular phone companies were engaged in a freebie war, each offering various services thrown in when one purchased a plan."

  • (uncountable) A particular card game for two players, notable for having its outcome predetermined by how the cards are dealt.
  • (uncountable) Organized, large-scale, armed conflict between countries or between national, ethnic, or other sizeable groups, usually involving the engagement of military forces.

    "The war was largely between Sunni and Shia militants."

  • (figuratively) A campaign against something.

    "The "war on drugs" is a campaign against the use of narcotic drugs."

  • (business, countable) A bout of fierce competition in trade.

    "I reaped the benefit of the car dealerships' price war, getting my car for far less than it's worth."

  • (obsolete) Armed forces.
  • (countable) By extension, any conflict, or anything resembling a conflict.

    "You look like you've been through the wars."

  • (figuratively) A campaign against something.

    "In the US, conservatives rail against the "war on Christmas"."


  • (intransitive) To engage in conflict (may be followed by "with" to specify the foe).

    "To war the Scot, and borders to defend. — Daniel."

  • To carry on, as a contest; to wage.

    "That thou […] mightest war a good warfare. — Tim. i. 18."

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