Semiannual or Semiiannual: How To spell?

The word Semiannual is misspelled against Semiiannual, an adjective meaning "Half-yearly."

Semiiannual has double "ii" is mispronounced as "i"
Remember double 'II' in between the strings sem & annual which should not be misspelled with single 'I'
Wrong Spelling:  sem-i-annual 
Correct Spelling:  sem-ii-annual 
Check more misspelled words of Semiiannual to spell it correct.