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quinquagenary
[ kwin-kwah-juh-ner-ee, kwing- ]
noun
, plural quin·quag·e·nar·ies.
- a 50th anniversary.
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Word History and Origins
Origin of quinquagenary1
1580–90; < Latin quīnquāgēnārius containing fifty, equivalent to quīnquāgēn ( ī ) fifty each + -ārius -ary
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