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

pertaining to 800 or a period of 800 years; marking the completion of 800 years.
noun, plural octocentenaries.
an 800th anniversary or its celebration.
noun (pl) -naries
an eight-hundredth anniversary


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