avencommon nounproper nounSyllable DecompositionavenEtymologyexpandfrom Occitan avenc and, further back, from Celtic abonā ('river'), related to Breton avon ('river') and avon.Definition1. Chasm carved by infiltration waters characteristic of karst regions.expandSynonymsgouffreiguePluralavensTranslationsenglish:swallow holespanish:sima