CENTENNIAL Meaning of CENTENNIAL in English [ sɛn'tɛnɪəl ]■ adjective relating to a hundredth anniversary. ■ noun a hundredth anniversary.OriginC18: from L. centum 'a hundred', on the pattern of biennial . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004