deontic
/dɪˈɒntɪk/adjective
attrib.
1- Philosophy of or relating to duty and obligation as ethical concepts【哲】（与）义务（有关）的。
1.1
- Linguistics expressing duty or obligation【语言学】表义务的。
词源
mid 19th cent. （as noun deontics）： from Greek deont-'being right' （from dei 'it is right'） + -IC.