Depresion or Depression: How To spell?
The word Depresion is misspelled against Depression, a noun meaning "A falling in of the surface; a sinking below its true place; a cavity or hollow; as, roughness consists in little protuberances and depressions."
Depression has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings depre & ion which should not be misspelled with single 'S'
Wrong Spelling:  depre-s-ion  Correct Spelling:  depre-ss-ion 
Find more incorrect spellings of Depression to spell right way.