Metathesis may refer to: Changes of vocal properties Metathesis (linguistics), alteration of the order of phonemes within a word Quantitative metathesis, exchange of long and short roles, without changing order of vowel sounds Chemical change in which a pair of molecules exchange electronic patterns of bonding Salt metathesis reaction, exchange of bonds between two reacting chemical species Olefin metathesis, redistribution of olefinic (alkene) chemical bonds Alkane metathesis, redistribution of alkane chemical bonds Alkyne metathesis, redistribution of alkyne chemical bonds