<p><strong>Noun</strong></p><ul><li>a person who commands.</li><li>a person who exercises authority; chief officer; leader.</li><li>the commissioned officer in command of a military unit.</li><li>U.S. Navy: an officer ranking below a captain and above a lieutenant commander.</li><li>a police officer in charge of a precinct or other unit.</li><li>the chief officer of a commandery in the medieval orders of Knights Hospitalers, Knights Templars, and others.</li><li>a member of one of the higher classes or ranks in certain modern fraternal orders, as in the Knights Templars.</li></ul>