Centenially or Centennially: How To spell?
The word Centenially is misspelled against Centennially, an adverb meaning "Once in a hundred years."
Centennially has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings cente & ially which should not be misspelled with single 'N'
Wrong Spelling:  cente-n-ially  Correct Spelling:  cente-nn-ially 
Find more wrongly spelled words of Centennially to spell it well.