WordReference Random House Unabridged Dictionary of American English © 2017
quin•qua•ge•nar•i•an  (kwing′kwə jə nârē ən, kwin′-),USA pronunciation adj. 
  1. 50 years of age.
  2. between the ages of 50 and 60.

n. 
  1. a person who is 50 years old or whose age is between 50 and 60.
  • Latin quīnquāgēnāri(us) (see quinquagenary) + -an
  • 1560–70


Collins Concise English Dictionary © HarperCollins Publishers::

quinquagenarian /ˌkwɪŋkwədʒɪˈnɛərɪən/ n
  1. a person between 50 and 59 years old
adj
  1. being between 50 and 59 years old
  2. of or relating to a quinquagenarian
Etymology: 16th Century: from Latin quinquāgēnārius containing fifty, from quinquāgēnī fifty each



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