Decapitate \De*cap"i*tate\, v. t. [imp. & p. p. {Decapitated}; p. pr. & vb. n. {Decapitating}.] [LL. decapitatus, p. p. of decapitare; L. de- + caput head. See {Chief}.] 1. To cut off the head of; to behead. 2. To remove summarily from office. [Colloq. U. S.]