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deontic

[dee-on-tik]
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adjective
  1. of or relating to duty and moral obligation as ethical concepts.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for deontic

deontic

adjective
  1. 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
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Word Origin

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