Synonyms of obligatory
- 1. obligatory (vs. optional), bounden, compulsory, mandatory, required, de rigueur, imposed, incumbent on(predicate), indispensable, prerequisite, necessary
- usage: morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution"
- 2. obligatory, necessary (vs. unnecessary)
- usage: required by obligation or compulsion or convention; "he made all the obligatory apologies"
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Definition and meaning of obligatory (Dictionary)