American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
WordNet
Elsewhere on the web
The Abbe Pernot was an amiable quinquagenarian, and a 'bon vivant', whose mind inclined more naturally toward the duties of daily life than toward meditation or contemplative studies.— The French Immortals Series — Complete
"Monsieur Foullepointe, my dear," says Adolphe, presenting the worthy quinquagenarian.— Petty Troubles of Married Life
That would be Life Ball, the charity fundraiser that sees the likes of telephone hurler Naomi Campbell, quinquagenarian siren Sharon Stone, and a whole lot of people in intricate costumes gather at Vienna's City Hall.— ETravelBlackboard.com
Enamoured as this sprightly quinquagenarian had always been of the other sex, and resolute as she was to show that an old war-horse could prance as bravely as a colt to the stirring trumpet call of youth, she had entered heart and soul into an existence which her late husband would have deprecated as strongly as he had once admired the spirit which led her to do it.— Too Old for Dolls A Novel
The problem as it presented itself to Lord Henry was rightly: how could this quinquagenarian be given a son whom she could worship?— Too Old for Dolls A Novel

American Heritage Dictionary (1)
Century Dictionary (1)
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