Quadrenial or Quadrennial: How To spell?

The word Quadrenial is misspelled against Quadrennial, an adjective meaning "Comprising four years; as, a quadrennial period."

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