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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.
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.
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Adv.1.centennially - every hundred years; once in a century; "the birthday of this city is being celebrated centennially"
References in periodicals archive ?
Although the Arctic climate varies annually, decadally, and centennially (Walsh and Chapman, 1990; Appenzeller et al.
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