Pronunciation (US) IPA (key): /əˈblɪɡətɔri/ or /ˈɑblɪɡətɔri/ (UK) IPA (key): /əˈblɪɡət(ə)ri/ Audio (UK)(file) Adjective Positive obligatory Comparative more obligatory Superlative most obligatory If something is obligatory, it needs to be done as it is required by law or moral. Synonym: mandatory Antonym: optionalWikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads