Diffision or Diffission: How To spell?
The word Diffision is misspelled against Diffission, a noun meaning "Act of cleaving or splitting."
Diffission has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings diffi & ion which should not be misspelled with single 'S'
Wrong Spelling:  diffi-s-ion  Correct Spelling:  diffi-ss-ion 
Find more incorrect spellings of Diffission to spell right way.