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Meaning of quadragenarian

quad•ra•ge•nar•i•an

Pronunciation: (kwod"ru-ju-nâr'ē-un), [key]
— adj.
  1. 40 years of age.
  2. between the ages of 40 and 50.
—n.
  1. a person who is 40 years old or whose age falls between 40 and 50.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.