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imponent

British  
/ ɪmˈpəʊnənt /

noun

  1. a person who imposes a duty, etc

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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He believes that Pope Gregory IX. is the intellectual originator, as well as the legislative imponent, of the terrific system which ripened gradually and experimentally in his pontificate.

From The History of Freedom by Acton, John Emerich Edward Dalberg Acton, Baron

But the idea of law implies an intelligent, authoritative imponent of some kind.

From The Universe a Vast Electric Organism by Warder, George Woodward