This is the 10019th most frequent Catalan word.
obligatoria
Mandatory.
In this sentence, "obligatòria" is used as an adjective modifying "participació," indicating it is a requirement.
La participació en aquest projecte és obligatòria.
Participation in this project is mandatory.
Here, "obligatòria" describes "assistència," indicating it is enforced by regulations.
L’assistència a classe és obligatòria segons les normes de l’escola.
Attendance in class is mandatory according to school rules.
The word "obligatòria" is contrasted with "optativa," showing its use to describe required versus optional circumstances.