Decesion or Decession: How To spell?
The word Decesion is misspelled against Decession, a noun meaning "Departure; decrease; -- opposed to accesion."
Decession has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings dece & ion which should not be misspelled with single 'S'
Wrong Spelling:  dece-s-ion  Correct Spelling:  dece-ss-ion 
Find more incorrect spellings of Decession to spell right way.