quinquagenary

[ kwin-kwah-juh-ner-ee, kwing- ]
/ kwɪnˈkwɑ dʒəˌnɛr i, kwɪŋ- /

noun, plural quin·quag·e·nar·ies.

a 50th anniversary.

Origin of quinquagenary

1580–90; < Latin quīnquāgēnārius containing fifty, equivalent to quīnquāgēn(ī) fifty each + -ārius -ary