To commandeer is to take possession or control of something, or to take control of something for a military or law-enforcement purpose, or to make someone help you.
1 One who exercises control and direction of a military or naval organization. 2  A naval officer whose rank is above that of a lieutenant commander and below that of captain. 3  One who exercises control and direction over a group of persons. 1. commandeer-take arbitrarily or by force; The Cubans commandeered the plane and flew it to Miami. highjack, hijack, pirate. crime, criminal offence, criminal offense, law-breaking, offense, offence - (criminal law) an act punishable by law; usually considered an evil act; a long record of crimes. verb. To commandeer is to take possession or control of something, or to take control of something for a military or law-enforcement purpose, or to make someone help you. Full Definition of COMMANDER. 1. : one in an official position of command or control: as a: commanding officer b: the presiding officer of a society or organization. 2. : a commissioned officer in the navy or coast guard ranking above a lieutenant commander and below a captain. — com·mand·er·ship \-ˌship\ noun. 1 When the police are chasing a suspect and they take your vehicle to do so, this is an example of when they commandeer your vehicle. 2  When you convince someone to help you plan a wedding even if he doesn't want to, this is an example of when you commandeer his help.
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definition commandeer