Definition

1. Noun:
   • A state in the west central United States in the Rocky Mountains: An abbreviation for the state of Colorado.
   • One who refuses to serve in the armed forces on grounds of conscience: A conscientious objector.
   • A hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition: The chemical symbol for the element cobalt (Co).
   • An odorless very poisonous gas that is a product of incomplete combustion of carbon: The chemical formula for carbon monoxide (CO).

Usage Examples

• Noun (State):
  • I went skiing in CO last winter.
• Noun (Conscientious Objector):
  • During the war, he registered as a CO.
• Noun (Chemical Element):
  • Cobalt (Co) is used in making strong alloys.
• Noun (Gas):
  • The alarm detected dangerous levels of CO in the house.

Advanced Usage

• "CO" as an abbreviation in addresses: Used in postal addresses to represent the state of Colorado.
  • Denver, CO 80202
• "CO" in medical/technical contexts: Refers to carbon monoxide poisoning.
  • The patient was treated for CO inhalation.

Variants and Related Words

• Colorado: The full name of the state abbreviated as CO.
• Cobalt: The full name of the metallic element Co.
• Carbon monoxide: The full name of the poisonous gas CO.
• Company (Co.): A common abbreviation in business names (e.g., & Co.). Note: This is a distinct abbreviation, often written with a period (Co.).

Synonyms

• For the state: Colorado.
• For the person: Conscientious objector.
• For the element: Cobalt (symbol Co).
• For the gas: Carbon monoxide.

Related Phrases

• CO detector: A device that alerts to the presence of carbon monoxide gas.
  • Every home should have a working CO detector.
• CO poisoning: Illness caused by inhaling carbon monoxide.
  • Symptoms of CO poisoning include headache and dizziness.

Noun

1. a state in west central United States in the Rocky Mountains
2. one who refuses to serve in the armed forces on grounds of conscience
3. a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
4. an odorless very poisonous gas that is a product of incomplete combustion of carbon