The 14 letter word with six letter i's is "INDIVISIBILITY."
Indivisibility means incapable of undergoing division.
Find 14 letter words that are answers to different crossword clues from sources below:
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Of interest, did you know that the longest one-syllable word in the English language is "screeched"? and "dreamt" is the only English word that ends in the letters "mt"?
Discover more fun facts about words and the English language from these sources:
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interestingliterature.com