Commandeer \Com`man*deer"\, v. t. [imp. & p. p. {Commandeered}; p. pr. & vb. n. {Commandeering}.] [D. kommandeeren to command, in South Africa to commandeer, fr. F. commander to command. See {Command}.] 1. (Mil.) To compel to perform military service; to seize for military purposes; -- orig. used of the Boers. 2. To take arbitrary or forcible possession of. [Colloq.]