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quinquagenarian
[quinquagenarian 词源字典]
"A person who is between 50 and 59 years old", Early 19th century: from
Latin
quinquagenarius
(based on
quinquaginti
'fifty') +
-an
.
[quinquagenarian etymology, quinquagenarian origin, 英语词源]
[quinquagenarian 词源字典]