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