octocentenary

[ ok-toh-sen-ten-uh-ree, -sen-tn-er-ee or, especially British, -sen-tee-nuh-ree ]
/ ˌɒk toʊ sɛnˈtɛn ə ri, -ˈsɛn tnˌɛr i or, especially British, -sɛnˈti nə ri /

adjective

pertaining to 800 or a period of 800 years; marking the completion of 800 years.

noun, plural oc·to·cen·ten·ar·ies.

an 800th anniversary or its celebration.

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Origin of octocentenary

First recorded in 1885–90; octo- + centenary
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for octocentenary

octocentenary
/ (ˌɒktəʊsɛnˈtiːnərɪ) /

noun plural -naries

an eight-hundredth anniversary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012