CO

Definitions of CO
  1. noun
    a state in west central United States in the Rocky Mountains
    synonyms: Centennial State, Colorado
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    example of:
    American state
    one of the 50 states of the United States
  2. noun
    an odorless very poisonous gas that is a product of incomplete combustion of carbon
    synonyms: carbon monoxide, carbon monoxide gas
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    type of:
    monoxide
    an oxide containing just one atom of oxygen in the molecule
  3. noun
    one who refuses to serve in the armed forces on grounds of conscience
    synonyms: conscientious objector
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    type of:
    contestant, dissenter, dissident, objector, protester
    a person who dissents from some established policy
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