Home Misspellings How to spell auxillary? Auxillary or auxiliary? Which one is correct? by hersey April 20, 2017 Reading Time: 0min, 7sc + - 0 Auxillary or Auxiliary Which one is correct? You can find the answer below. Incorrect Auxillary Correct Auxiliary You can find more information about Auxiliary word here. Rate this post Correct spelling of auxillaryHow do you spell auxillary?