nonagenarian UK /ˌnɒnəd͡ʒɪˈnɛːrɪən/US /ˌnɑnəd͡ʒɪˈnɛriən/adjective 1noun 1forms 1 adjective1 •Of or related to ninetysomethings."But what’s that got to do with your health and longevity?" the neighbor inquired. "Why," said the nonagenarian, "I've spent most of my life in the open air." — 1954 noun1 •Synonym of ninetysomething: a person between 90 and 99 years old. formsnonagenarians
