Septenially or Septennially: How To spell?
The word Septenially is misspelled against Septennially, an adverb meaning "Once in seven years."
Septennially has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings septe & ially which should not be misspelled with single 'N'
Wrong Spelling:  septe-n-ially  Correct Spelling:  septe-nn-ially 
Find more wrongly spelled words of Septennially to spell it well.