Added 10 October 2026 medicare noun Categories: ActionsUncommon Words noun ! Definition from WordNet 3.1, Princeton University. More about medicare at Wordnik → Where our words come from → Health care for the aged; a federally administered system of health insurance available to persons aged 65 and over. Related Words: medicaidhealthcareinsurancemsphealthmcpsicknessmedicalhealth-care Back to today's word