Source : Webster's Revised Unabridged Dictionary (1913)

Dictatorship \Dic*ta"tor*ship\, n.
   The office, or the term of office, of a dictator; hence,
   absolute power.

Source : WordNet®

dictatorship
     n : a form of government in which the ruler is an absolute
         dictator (not restricted by a constitution or laws or
         opposition etc.) [syn: {absolutism}, {authoritarianism},
         {Caesarism}, {despotism}, {monocracy}, {one-man rule}, {shogunate},
          {Stalinism}, {totalitarianism}, {tyranny}]