Ascerteanment or Ascertainment: How To spell?

The word Ascerteanment is misspelled against Ascertainment, a noun meaning "The act of ascertaining; a reducing to certainty; a finding out by investigation; discovery."

Word contains consecutive vowels 'AI' in between alphabets ascert & nment is misspelled as 'EA'
Wrong Spelling:  ascert-ea-nment 
Correct Spelling:  ascert-ai-nment 
Explore spell check of Ascertainment to spell without errors.

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