Concesionist or Concessionist: How To spell?
The word Concesionist is misspelled against Concessionist, a noun meaning "One who favors concession."
Concessionist has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings conce & ionist which should not be misspelled with single 'S'
Wrong Spelling:  conce-s-ionist  Correct Spelling:  conce-ss-ionist 
Find more incorrect spellings of Concessionist to spell right way.