This is the 3002nd most frequent Dutch word.
bijhorende
"Bijhorende" means "associated" or "belonging to."
Here, 'bijhorende' describes the key, indicating it belongs with or is associated with something (possibly a lock).
De bijhorende sleutel ligt op de tafel.
The accompanying key is on the table.
In this sentence, 'bijhorende' refers to documents that are included because they are relevant or related to the context.
Bijhorende documenten worden in de envelop gevoegd.
Accompanying documents are included in the envelope.
In this example, 'bijhorende' modifies the card, signifying it is related to or goes with something else that is implied.