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Not to be confused with metastasis.
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Metathesis (from the Greek μετάθεσις "transposition") may refer to:
- Metathesis (linguistics), in phonology, a sound change that alters the order of phonemes in a word
- Quantitative metathesis, a situation in which two vowel sounds follow directly one after the other and a transposition of vowel length takes place
- Metathesis reaction, in chemistry, a bimolecular process involving the exchange of bonds between the two reacting chemical species
- Olefin metathesis, an organic reaction which involves redistribution of olefinic (alkene) bonds
- Alkane metathesis, a chemical reaction in which alkanes are rearranged to give longer or shorter alkane products
- Alkyne metathesis, an organic reaction involving the redistribution of alkyne chemical bonds
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