deontic

[ dee-on-tik ]
/ diˈɒn tɪk /

adjective

of or relating to duty and moral obligation as ethical concepts.

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British Dictionary definitions for deontic

deontic
/ (diːˈɒntɪk) /

adjective

logic
  1. of or relating to such ethical concepts as obligation and permissibility
  2. designating the branch of modal logic that deals with the formalization of these concepts

Word Origin for deontic

C19: from Greek deon duty, from impersonal dei it behoves, it is binding
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