One who exercises control and direction over a group of persons.
One who exercises control and direction of a military or naval organization.
A designation or rank in certain non-military organizations such as NASA and various police forces.
A naval officer whose rank is above that of a lieutenant commander and below that of captain.
A rank within an honorary order: e.g. Commander of the Legion of Honour.
Any of various nymphalid butterflies of the Asian genus Moduza.
A heavy beetle or wooden mallet, used in paving, in sail lofts, etc.
One who sets the pace in a race, to guide the others.
A set of nerves which stimulate the heart to beat.
A medical implement that is used to stimulate a heart to beat by simulating the action of the natural pacemaker.