Definition of CO in English:

CO

  • 1Colorado (in official postal use)

  • 2Commanding Officer.

    leader, head, headman, boss, chief, director, manager, overseer, controller, master
    View synonyms
  • 3Conscientious objector.

Pronunciation:

CO

/ˌsēˈō/

Definition of Co in English:

Co

  • The chemical element cobalt.

Pronunciation:

Co

/ˌsēˈō/