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obligatory /əˈblɪgəˌtori/  /Brit əˈblɪgətri/

  • adjective
    formal :required by a law or rule
    obligatory [=mandatorymilitary service
    The training is obligatory for all personnel.
    always used before a noun humorous :always or often included as a familiar and expected part of something
    This action movie includes the obligatory chase scenes.