This is the 1420th most frequent Catalan word.
obligatòria
Mandatory.
Used as an adjective referring to a rquirement or necessity enforced by a rule.
L'uniforme és obligatòria a l'escola.
The uniform is mandatory at the school.
Used as an adjective indicating that an action is not enforced nor required.
La presència dels assistents no és obligatòria.
The attendance of the participants is not mandatory.
Here, it signifies a requirement or protocol that must be followed for certain reasons.