quinquagenary

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

noun, plural quin·quag·e·nar·ies.

a 50th anniversary.

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Origin of quinquagenary

1580–90; < Latin quīnquāgēnārius containing fifty, equivalent to quīnquāgēn(ī) fifty each + -ārius -ary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020