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Meaning of octocentenary

oc•to•cen•ten•ar•y

Pronunciation: (ok"tō-sen-ten'u-rē, -sen'tn-er"ē or, esp. Brit., -sen-tē'nu-rē), [key]
— adj., n., pl. -ar•ies.
—adj.
  1. pertaining to 800 or a period of 800 years; marking the completion of 800 years.
—n.
  1. an 800th anniversary or its celebration.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.