Quadrenium or Quadrennium: How To spell?

The word Quadrenium is misspelled against Quadrennium, a noun meaning "A space or period of four years."

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