deontic

de·on·tic  (d-ntk)

adj.

Of, relating to, or concerning duties or obligations: deontic logic.

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[Greek deon, deont-, obligation, necessity; see deontology.]

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deontic [diːˈɒntɪk]

adj

(Philosophy / Logic) Logic

a.  of or relating to such ethical concepts as obligation and permissibility

b.  designating the branch of modal logic that deals with the formalization of these concepts

[from Greek deon duty, from impersonal dei it behoves, it is binding]