Centenial or Centennial: How To spell?
The word Centenial is misspelled against Centennial, a noun meaning "The celebration of the hundredth anniversary of any event; a centenary."
Centennial has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings cente & ial which should not be misspelled with single 'N'
Wrong Spelling:  cente-n-ial  Correct Spelling:  cente-nn-ial 
Find more wrongly spelled words of Centennial to spell it well.