'obligatory' definitions:
Definition of 'obligatory'
From: WordNet
adjective
Morally or legally constraining or binding; "attendance is obligatory"; "an obligatory contribution" [ant: optional]
adjective
Required by obligation or compulsion or convention; "he made all the obligatory apologies"
Synonyms of 'obligatory'
From: Moby Thesaurus
- absolute,
- binding,
- choiceless,
- compulsory,
- conclusive,
- de rigueur,
- decisive,
- decretory,
- demanded,
- dictated,
- entailed,
- essential,
- exigent,
- final,
- hard-and-fast,
- imperative,
- imperious,
- importunate,
- imposed,
- incumbent,
- indispensable,
- inevitable,
- involuntary,
- irrevocable,
- mandated,
- mandatory,
- must,
- necessary,
- necessitous,
- peremptory,
- prescript,
- prescriptive,
- required,
- requisite,
- ultimate,
- urgent,
- without appeal,
- without choice