noun (n)

• an officer in command of a military unit(noun.person)

  Synonym:
  commandant, commanding officer
  

  source: wordnet30
• someone in an official position of authority who can command or control others(noun.person)

  source: wordnet30
• a commissioned naval officer who ranks above a lieutenant commander and below a captain(noun.person)

  source: wordnet30
• an officer in the airforce(noun.person)

  Synonym:
  air force officer
  

  source: wordnet30
• A chief; one who has supreme authority; a leader; the chief officer of an army, or of any division of it.(noun)

  source: webster1913