Introcesion or Introcession: How To spell?
The word Introcesion is misspelled against Introcession, a noun meaning "A depression, or inward sinking of parts."
Introcession has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings introce & ion which should not be misspelled with single 'S'
Wrong Spelling:  introce-s-ion  Correct Spelling:  introce-ss-ion 
Find more incorrect spellings of Introcession to spell right way.