- Transposition, as of the letters or syllables of a
word; as, pistris for pristis; meagre for meager. - A mere change in place of a morbid substance, without
removal from the body. - The act, process, or result of exchange, substitution,
or replacement of atoms and radicals; thus, by metathesis an acid gives
up all or part of its hydrogen, takes on an equivalent amount of a
metal or base, and forms a salt.