quadrature amplitude modulationEnglishOxford New American Dictionaryquadrature amplitude modulation /ˈkwädrəCHər ˈampləˌt(y)o͞od ˌmäjəˈlāSHən, ˈkwɑdrətʃər ˈæmpləˌt(j)ud ˌmɑdʒəˈleɪʃən/ ▸ noun Telecommunications a modulation system used in microwave and satellite communication, involving phase and amplitude modulation of a carrier wave.