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obligatory

 
Adjective obligatory has 2 senses
  1. obligatory - morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution"
    Antonyms:
    optional, elective, ex gratia, facultative, nonmandatory, nonobligatory
  2. obligatory - required by obligation or compulsion or convention; "he made all the obligatory apologies"
    Antonyms:
    unnecessary, unneeded (indirect, via necessary)
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