Aare UK/ˈɑː.ɹə/ US/ˈɑ.ɹə/ uncommon noun 1. a river in north central Switzerland that runs northeast into the Rhine SynonymsAarAare River Related words Word family Aare River Broader terms river Parts Switzerland WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.