Meaning of quinquagenary

quin•quag•e•nar•y

Pronunciation: (kwin-kwä'ju-ner"ē, kwing-), [key]
— pl. -nar•ies.
  1. a 50th anniversary.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
quinquagenarian Quinquagesima