obligatorio
mandatory
adjective oh-blee-gah-TOH-ryoh Less Common
Also means
compulsory
Usage Note
Obligatorio means compulsory or required by rule or law — asignatura obligatoria (required subject), servicio obligatorio (mandatory service). Its antonym is optativo or voluntario. The adverb obligatoriamente and noun obligatoriedad are both used in legal and official language.
Examples
"El uso del casco es obligatorio en moto."
Natural Translation
Wearing a helmet is mandatory on a motorcycle.

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