obligatory
adjective
- legally or morally binding; constituting, or having the nature of, an obligation; required
- Biol. obligate
See obligatory in American Heritage Dictionary 4
(ə-blĭgˈə-tôrˌē, -tōrˌē, ŏbˈlĭ-gə-)
adjective- Morally or legally constraining; binding.
- Imposing or recording an obligation: a bill obligatory.
- Of the nature of an obligation; compulsory: Attendance is obligatory. Mathematics is an obligatory course.
- Biology Obligate.
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