executive officer

noun
1.
the officer second in command of a military or naval organization.
2.
an officer charged with executive duties, as in a corporation.

Origin:
1780–90

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World English Dictionary
executive officer
 
n
1.  XO the second-in-command of any of certain military units
2.  a specialist seaman officer, responsible under the captain for the routine efficient running of the ship in the US, British (formerly), and certain other navies

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Example sentences
Other relevant industry-recognized professional certifications and prior
  experience as a chief executive officer are desired.
West is the company's president and chief executive officer, and a well-known
  figure in biotech circles.
One proposes to be chairman of the board, the other sees himself as chief
  executive officer.
That's one of the reason we've got a new program executive officer and a
  tremendous amount of focus.
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