Quadrienial or Quadriennial: How To spell?

The word Quadrienial is misspelled against Quadriennial, an adjective meaning "Same as Quadrennial."

Quadriennial has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings quadrie & ial which should not be misspelled with single 'N'
Wrong Spelling: quadrie-n-ial
Correct Spelling: quadrie-nn-ial
Check more misspelled words of Quadriennial to spell it correct.