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1. Especially indicating a form of prosecution in which proceedings are secret and the accused is questioned by a prosecutor who acts also as the judge
    
2. Marked by inquisitive interest; especially suggestive of an ecclesiastical inquisitor
   "the press was inquisitorial to the point of antagonism"; "a practical police force with true inquisitorial talents"
    
3. Having the authority to conduct official investigations
   "the inquisitorial power of the Senate"

See also: inquiring, inquisitor

Antonym: accusatorial

Encyclopedia: Inquisitorial