Definition of quinquagenary in English:

quinquagenary

noun

rare
  • A fiftieth anniversary; the celebration of such an anniversary.

adjective

rare
  • Of or relating to a fiftieth anniversary.

Origin

Late Middle English (in an earlier sense). From classical Latin quīnquāgēnārius.

Pronunciation

quinquagenary

/kwɪŋˈkwadʒɪn(ə)ri//kwɪnˈkwadʒɪn(ə)ri/