macroevolutionEnglishOxford New American Dictionarymacroevolution /ˌmakrō-evəˈlo͞oSHən, ˌmækroʊ-ɛvəˈluʃən / ▸ noun Biology major evolutionary change. The term applies mainly to the evolution of whole taxonomic groups over long periods of time. – DERIVATIVES macroevolutionary /-SHəˌnerē, -ˌēvə-/ adjective