quinquagenarian UK /ˌkwɪŋkwəd͡ʒɪˈnɛəɹɪən/US /ˌkwɪŋkwəd͡ʒəˈnɛɹiən/adjective 2noun 2forms 1 adjective2 •Of or related to fiftysomethings. •(no longer used, rare) Of or related to command over 50 men. noun2 •Synonym of fiftysomething: a person between 50 and 59 years old. •(no longer used, rare) Synonym of pentecoster: an officer who commands 50 men. formsquinquagenarians
