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compulsory

Examples
In a sentence
Angličtina je povinný predmet.
English is a compulsory subject.
V Brazílii je hlasovanie povinné.
In Brazil, voting is mandatory.
Helma je pri bicyklovaní povinná pre deti.
A helmet is compulsory for children when cycling.
Povinné očkovanie majú podľa kalendára.
They have compulsory vaccinations according to the schedule.
Examples from Tatoeba (CC BY 2.0 FR).
Source
Slovak National Corpus (SNK) ↗English gloss from the frequency publish path. Includes Tatoeba example sentences when present.
Full attribution on References.