Progresion or Progression: How To spell?
The word Progresion is misspelled against Progression, a noun meaning "A regular succession of tones or chords; the movement of the parts in harmony; the order of the modulations in a piece from key to key."
Progression has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings progre & ion which should not be misspelled with single 'S'
Wrong Spelling:  progre-s-ion  Correct Spelling:  progre-ss-ion 
Find more incorrect spellings of Progression to spell right way.