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Adjective: obligatory  u'bli-gu,to-ree [N. Amer], u'bli-gu-t(u-)ree [Brit]
  1. Morally or legally constraining or binding
    "an obligatory contribution"; "attendance is obligatory";
    - irremissible
  2. Required by obligation, compulsion or convention
    "he made all the obligatory apologies"

See also: bounden [archaic], compulsory, de rigueur, imposed, incumbent on, indispensable, mandatory, necessary, prerequisite, required

Antonym: optional

Encyclopedia: Obligatory