Home Misspellings How to spell auxilliary? Auxilliary or auxiliary? Which one is correct? by hersey March 17, 2017 Reading Time: 0min, 7sc + - 0 Auxilliary or Auxiliary Which one is correct? You can find the answer below. Incorrect Auxilliary Correct Auxiliary You can find more information about Auxiliary word here. Rate this post Correct spelling of auxilliaryHow do you spell auxilliary?