Home Misspellings How to spell addional? Addional or additional? Which one is correct? by hersey March 7, 2017 Reading Time: 0min, 7sc + - 0 Addional or Additional Which one is correct? You can find the answer below. Incorrect Addional Correct Additional You can find more information about Additional word here. Rate this post Correct spelling of addionalHow do you spell addional?