The quality or state of being dictatorial; the characteristic of acting in an autocratic and authoritarian manner.
From 'dictatorial' + '-ness' (noun suffix meaning 'quality or state'). The '-ness' suffix is one of the oldest in English, creating abstract nouns from adjectives.
Psychologists studying leadership sometimes measure 'dictatorialness' as a personality trait—people high in this trait tend to have trouble with teamwork and delegating!
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