Aditament or Additament: How To spell?
The word Aditament is misspelled against Additament, a noun meaning "An addition, or a thing added."
Additament has double "dd" is mispronounced as "d"Remember double 'DD' in between the strings A & itament which should not be misspelled with single 'D'
Wrong Spelling:  A-d-itament  Correct Spelling:  A-dd-itament 
Find more wrongly spelled words of Additament to spell it well.