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commander in chief

  1. the supreme commander of the armed forces of a nation, as, in the U.S., the President
  2. an officer in command of all armed forces in a certain theater of war

See commander in chief in American Heritage Dictionary 4

noun pl. commanders in chief commanders in chief Abbr. CINC or C in C
  1. The supreme commander of all the armed forces of a nation.
  2. The officer commanding a major armed force.

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