the officer second in command of a military or naval organization.
an officer charged with executive duties, as in a corporation.
the second-in-command of any of certain military units (US) XO
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
noun, (often initial capital letters) 1. an order having the force of law issued by the president of the U.S. to the army, navy, or other part of the executive branch of the government.
noun 1. . noun 1. a commercial complex consisting of an office building set in parklike surroundings, often with such facilities as parking lots, restaurants, and recreational areas.
noun 1. the discretionary right claimed by certain U.S. presidents to withhold information from Congress or the judiciary.
noun 1. a secretary with independent administrative responsibilities who assists an executive in a business firm. 2. an official who directs the business operations of an organization, especially a nonprofit one.