This is the 678th most frequent Spanish word.
europea
"Europea" means "European" (feminine form) in English.
'Europea' here is an adjective describing nationality or origin, attributing 'European' quality to the writer.
Ella es una escritora europea muy famosa.
She is a very famous European writer.
In this sentence, 'Europea' modifies the noun 'tradición', indicating the tradition’s origin or influence being from Europe.
La tradición europea ha influido en nuestra cultura.
The European tradition has influenced our culture.
Here, 'Europea' is used as a proper noun's adjective to specify the type of union.