Undecenary or Undecennary: How To spell?

The word Undecenary is misspelled against Undecennary, an adjective meaning "Occurring once in every period of eleven years; undecennial."

Undecennary has double "nn" is mispronounced as "n"
Remember double 'NN' in between the strings undece & ary which should not be misspelled with single 'N'
Wrong Spelling: undece-n-ary
Correct Spelling: undece-nn-ary
Explore spell check of Undecennary to spell without errors.