Quinquagenarian Definition
 kwĭngkwə-jə-nârē-ən 
    noun
  
 A person of this age.
 Webster's New World 
    adjective
  
 Of or characteristic of a person in his or her fifties.
 American Heritage 
50 years old, or between the ages of 50 and 60
 Webster's New World 
Of or relating to a quinquagenarian.
 Wiktionary 
Other Word Forms of Quinquagenarian
Noun
Singular:
 quinquagenarianPlural:
 quinquagenariansOrigin of Quinquagenarian
-  
From Latin quīnquāgēnārius containing fifty from quīnquāgēnī fifty each from quīnquāgintā fifty penkwe in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
 -  
From Latin quinquagenarius (“containing fifty"), from quinquegeni (“fifty each"), from quinquaginta (“fifty") +"Ž -an
From Wiktionary
 
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