Pronunciation enPR: kəm-pŭl'sə-rē IPA (key): /kəmˈpʌlsəri/ Audio (UK)(file) Adjective Positive compulsory Comparative more compulsory Superlative most compulsory When something is compulsory, it is required and has to be followed. Synonyms: mandatory, obligatory and required Antonym: optional In most countries, it is compulsory to vote during elections and failing to do so is a crime.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads