Video shows what vicariance means. The separation of a group of organisms by a geographic barrier, resulting in differentiation of the original group into new varieties or species. The geological event which produces such a barrier (volcano, earthquake, etc). The act of experiencing an event by proxy through an empathic link with the person who is experiencing the event firsthand.. Vicariance Meaning. How to pronounce, definition audio dictionary. How to say vicariance. Powered by MaryTTS, Wiktionary