MedicarePronunciation: /ˈmɛdɪkɛː/Translate Medicare | into German | into Spanish Definition of Medicare (in the US) a federal system of health insurance for people over 65 years of age. (in Canada and Australia) a national health-care scheme financed by taxation. Origin: 1960s: from medical + careMedicare in other Oxford dictionaries Definition of Medicare in the US English dictionary