This is the 5233rd most frequent Catalan word.
biennal
Occurring every two years.
Here, 'biennal' functions as an adjective describing the frequency of the art festival, indicating it happens every two years.
El festival biennal d'art contemporani atreu artistes de tot el món.
The biennial contemporary art festival attracts artists from all over the world.
In this sentence, 'biennal' again serves as an adjective to describe an event, specifying the recurring two-year interval.
La universitat organitza un congrés biennal sobre innovació.
The university organizes a biennial conference on innovation.
Here, 'biennal' signifies that the magazine is issued once every two years.