Premilennial or Premillennial: How To spell?
The word Premilennial is misspelled against Premillennial, an adjective meaning "Previous to the millennium."
Premillennial has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings premi & ennial which should not be misspelled with single 'L'
Wrong Spelling:  premi-l-ennial  Correct Spelling:  premi-ll-ennial 
Find more wrongly spelled words of Premillennial to spell it well.