Also found in: Thesaurus.
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.
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|Adv.||1.||centennially - every hundred years; once in a century; "the birthday of this city is being celebrated centennially"|