Search Result for "centennially": 
Wordnet 3.0

ADVERB (1)

1. every hundred years; once in a century;
- Example: "the birthday of this city is being celebrated centennially"



The Collaborative International Dictionary of English v.0.48:

Centennially \Cen*ten"ni*al*ly\, adv.
   Once in a hundred years.
   [1913 Webster]


WordNet (r) 3.0 (2006):

centennially
    adv 1: every hundred years; once in a century; "the birthday of
           this city is being celebrated centennially"