This is the 10696th most frequent German word.
rinteln
"Rinteln" is not a German word; it is a town in Lower Saxony, Germany.
Here, 'Rinteln' is used as a proper noun, the name of a town in Germany.
Ich habe Rinteln letzte Woche besucht.
I visited Rinteln last week.
In this sentence, 'Rinteln' refers to the same town as the location where an education was completed.
Mein Cousin hat seine Ausbildung in Rinteln abgeschlossen.
My cousin completed his education in Rinteln.
This usage of 'Rinteln' highlights the town's historical or cultural aspect, describing a specific part of it, the old town.