Usually means: Second in command to captain.
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We found 15 dictionaries that define the word first officer:

General (14 matching dictionaries)
  1. first officer: Merriam-Webster
  2. first officer: Oxford Learner's Dictionaries
  3. first officer: Collins English Dictionary
  4. first officer: Wordnik
  5. first officer: Cambridge Advanced Learner's Dictionary
  6. first officer: Wiktionary
  7. first officer: Infoplease Dictionary
  8. First officer, first officer: Dictionary.com
  9. First Officer (civil aviation), First Officer (disambiguation), First officer (aeronautics), First officer (aviation), First officer (civil aviation), First officer: Wikipedia, the Free Encyclopedia
  10. first officer: FreeDictionary.org
  11. first officer: TheFreeDictionary.com
  12. first officer: Longman Dictionary of Contemporary English

Computing (1 matching dictionary)
  1. first officer: Encyclopedia

Definitions from Wiktionary (first officer)

noun:  The copilot of an aircraft.
noun:  The chief mate of a merchant ship.
noun:  The executive officer, second in command of a naval vessel.
noun:  The most senior civil servant in the United States Foreign Service, with responsibility for running an embassy under the authority of and reporting to the ambassador.
noun:  Air Transport Auxiliary rank corresponding to Flight Lieutenant in the Royal Air Force.
noun:  Women's Royal Naval Service rank corresponding to Lieutenant-Commander in the Royal Navy.

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