centennially


cen·ten·ni·al

C0197200 (sĕn-tĕn′ē-əl)adj.1. Of or relating to an age or period of 100 years.2. Occurring once every 100 years: a centennial commemoration.3. Of or relating to a 100th anniversary.n. A 100th anniversary or a celebration of it.
[Latin centum, hundred; see dekm̥ in Indo-European roots + (bi)ennial.]
cen·ten′ni·al·ly adv.
Thesaurus
Adv.1.centennially - every hundred years; once in a century; "the birthday of this city is being celebrated centennially"