ethics, especially that branch dealing with duty, moral obligation, and right action.

1820–30; < Greek deont- that which is binding (stem of déon, neuter present participle of deîn to bind), equivalent to de- bind + -ont- present participle suffix + -o- + -logy

deontological [dee-on-tl-oj-i-kuhl] , adjective
deontologist, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
deontological (dɪˌɒntəˈlɒdʒɪkəl)
philosophy (of an ethical theory) regarding obligation as deriving from reason or as residing primarily in certain specific rules of conduct rather than in the maximization of some good

deontology (ˌdiːɒnˈtɒlədʒɪ)
the branch of ethics dealing with duty, moral obligation, and moral commitment
[C19: from Greek deon duty (see deontic) + -logy]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1826, from Gk. deont-, comb. form of deon "that which is binding, duty," neut. prp. of dei "is binding;" + -logia "discourse" (see -logy). Related: Deontological (1832).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for deontological
However, deontological constraints themselves prohibit such action.
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