Source : Webster's Revised Unabridged Dictionary (1913)

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.]