obligatoire
compulsory
adjective oh-blee-ga-TWAR Rare
Origin: Latin 'obligatorius'
Also means
mandatory
Usage Note
Obligatoire is invariable in gender (same form for masculine and feminine). It is stronger than nécessaire (necessary), implying a legal or institutional requirement. The adverb obligatoirement means 'necessarily' but also carries the informal sense of 'inevitably' in spoken French, similar to 'bound to' in English.
Examples
"Le port de la ceinture est obligatoire."
Natural Translation
Wearing a seatbelt is compulsory.

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