Excusion or Excussion: How To spell?
The word Excusion is misspelled against Excussion, a noun meaning "The act of excusing; seizure by law."
Excussion has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings excu & ion which should not be misspelled with single 'S'
Wrong Spelling:  excu-s-ion  Correct Spelling:  excu-ss-ion 
Check more misspelled words of Excussion to spell it correct.