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"dictatorial" is also used as a crossword clue. If that's what you saw, the answer is often autocratic (10 letters).
Definitions
characteristic of an absolute ruler or absolute rule; having absolute sovereignty
Word origin
From dictator + -ial.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Bossy and absolute”11 letters
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