commander

n. leader, one who is in charge; officer in charge of a unit (Military)

Commander is a military rank which is also sometimes used as a military title depending on the individual customs of a given military service. Commander is also used as a rank or title in some organizations outside of the military, particularly in police and law enforcement.
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Noun
1. an officer in command of a military unit
(synonym) commanding officer, commandant
(hypernym) military officer, officer
(hyponym) Supreme Allied Commander Atlantic, SACLANT
(derivation) control, command
(classification) military, armed forces, armed services, military machine, war machine
2. someone in an official position of authority who can command or control others
(hypernym) leader
(derivation) control, command
3. a commissioned naval officer who ranks above a lieutenant commander and below a captain
(hypernym) commissioned naval officer
(derivation) control, command
(classification) military, armed forces, armed services, military machine, war machine
4. an officer in the airforce
(synonym) air force officer
(hypernym) serviceman, military man, man, military personnel
(derivation) control, command

CDR, Compact Disk Recordable, compact disk that may be written on; (Military) commander, officer in charge of a unit

v. command, order; bid, drive