Intelsat Syllabification: (In·tel·sat)Pronunciation: /ˈintelˌsat/Definition of Intelsat trademark an international organization of more than 100 countries, formed in 1964, that owns and operates the worldwide commercial communications satellite system. Origin:from In(ternational) Tel(ecommunications) Sat(ellite Consortium)Intelsat in other Oxford dictionaries Definition of Intelsat in the British & World English dictionary