Definition of quinquagenarian in English:

quinquagenarian

Line breaks: quin¦qua|gen¦ar¦ian
Pronunciation: /ˌkwɪŋkwədʒɪˈnɛːrɪən/

Entry from British & World English dictionary

noun

A person who is between 50 and 59 years old.

Origin

early 19th century: from Latin quinquagenarius (based on quinquaginti 'fifty') + -an.

Definition of quinquagenarian in:

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lack of modesty