sexcentenary: Meaning and Definition of

sex•cen•ten•ar•y

Pronunciation: (seks"sen-ten'u-rē, seks-sen'tn-er"ē or, esp. Brit. -sen-tē'nu-rē), [key]
— adj., n., pl. -nar•ies.
—adj.
  1. pertaining to 600 or a period of 600 years; marking the completion of 600 years.
—n.
  1. a 600th anniversary or its celebration.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.