Etymology
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dictatorial (adj.)

1701, "pertaining to a dictator; absolute, unlimited;" see dictator + -ial. Meaning "imperious, overbearing" is from 1704. Related: Dictatorially. Earlier in the sense "pertaining to a dictator" were dictatorian (1640s); dictator-like (1580s). "Dictatorial implies, on the one hand, a disposition to rule, and, on the other, a sharp insistence upon having one's orders accepted or carried out." [Century Dictionary]

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Definitions of dictatorial

dictatorial (adj.)
of or characteristic of a dictator;
dictatorial powers
dictatorial (adj.)
expecting unquestioning obedience;
dictatorial (adj.)
characteristic of an absolute ruler or absolute rule; having absolute sovereignty;
a dictatorial rule that lasted for the duration of the war
Synonyms: authoritarian / autocratic / despotic / tyrannic / tyrannical
From wordnet.princeton.edu