This is the 9333rd most frequent German word.
mattersburg
"Mattersburg" is not a German word with a specific meaning; it is the name of a town in Austria.
Here, 'Mattersburg' is used as a proper noun, referring to the name of a specific town.
Mattersburg ist eine kleine Stadt im Burgenland.
Mattersburg is a small town in Burgenland.
In this sentence, 'Mattersburg' acts as the direct object of the verb 'besucht' (visited).
Ich habe letztes Wochenende Mattersburg besucht.
I visited Mattersburg last weekend.
In this example, 'Mattersburg' is the subject of the sentence, emphasizing its relation to its football team.