Source : Webster's Revised Unabridged Dictionary (1913)

Dictatorial \Dic`ta*to"ri*al\, a. [Cf. F. dictatorial.]
   1. Pertaining or suited to a dictator; absolute.

            Military powers quite dictatorial.    --W. Irving.

   2. Characteristic of a dictator; imperious; dogmatical;
      overbearing; as, a dictatorial tone or manner. --
      {Dic`ta*to"ri*al*ly}, adv. -- {Dic`ta*to"ri*al*ness}, n.

Source : WordNet®

dictatorial
     adj 1: of or characteristic of a dictator; "dictatorial powers"
     2: likened to a dictator in severity [syn: {authoritarian}]
     3: expecting unquestioning obedience; "he was imperious and
        dictatorial"; "the timid child of authoritarian parents";
        "insufferably overbearing behavior toward the waiter"
        [syn: {authoritarian}, {overbearing}]
     4: characteristic of an absolute ruler or absolute rule; having
        absolute sovereignty; "an authoritarian regime";
        "autocratic government"; "despotic rulers"; "a dictatorial
        rule that lasted for the duration of the war"; "a
        tyrannical government" [syn: {authoritarian}, {autocratic},
         {despotic}, {tyrannical}]