Definition of centennialize in English:
centennialize
(also centennialise)
verb sɛnˈtɛnɪəlʌɪzs(ə)nˈtɛnɪəlʌɪz
US rare with object To mark the centenary of; = centenarize. Formerly also without object: †to celebrate a centenary (obsolete).
Origin
Late 19th century. From centennial + -ize.