Centurial comes from Latin centuria ('a company of a hundred, division of a hundred') + -al, from centum ('hundred'). The historical trail runs through centuria in Latin and centum in Latin. Morphologically, centurial is transparent: it draws on Latin centuria ('a company of a hundred, division of a hundred') + -al, from centum ('hundred'). Used as an adjective, centurial now means "relating to a century or to a Roman century of soldiers", so the present definition can be read against the older forms and meanings. The same lexical family is also visible in related forms such as century and centurion. The result is a borrowed or transmitted form whose modern spelling carries a compact record of its route into English.