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It just doesn't make sense. "Define" has a long vowel and "definition" has short. Isn't "definition" the noun form of "define"? Shouldn't both have the same vowels? Why are both pronounced differently? Can someone explain it please?

Void
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    Does this answer your question? [Why are "south" and "southern" pronounced with different vowels?](https://ell.stackexchange.com/questions/265605/why-are-south-and-southern-pronounced-with-different-vowels) – Void Feb 05 '21 at 12:41
  • *Def**i**ne - def**i**nition, div**i**ne - div**i**nity, pron**ou**nce - pron**u**nciation, s**ou**th - s**ou**thern, der**i**ve - der**i**vative* etc., are all because of [Trisyllabic Laxing](https://ell.stackexchange.com/questions/265605/why-are-south-and-southern-pronounced-with-different-vowels). – Void Feb 05 '21 at 12:44
  • "It just doesn't make sense" - welcome to English pronunciation. – stangdon Feb 05 '21 at 16:32

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Probably because "define" ends with a silent e but "definition" does not.