From Longman Dictionary of Contemporary Englishtelephonyte‧leph‧o‧ny /təˈlefəni/ noun [uncountable] telephone services, systems, or communicationFrom Longman Business Dictionarytelephonyte‧leph‧o‧ny /təˈlefəni/ noun [uncountable] the activity and business of providing telephone servicesNow, devices for telephony, entertainment, and data all interact.