metathesis

Transposition within a word of letters, sounds, or syllables, as in the change from Old English brid to modern English bird or in the confusion of modren for modern.

Double displacement.

In grammar, transposition, more especially of the letters, sounds, or syllables of a word, as in the case of Anglo-Saxon ācsian, ās-cian, English ax, ask; Anglo-Saxon brid, English bird.

In surgery, a change in place of a morbid substance; an operation removing a morbific agent from one part to another, as in couching for cataract

In logic, same as conversion.

Transposition, as of the letters or syllables of a word

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.

the transposition of letters, syllables or sounds within a word, such as in ask as /æks/

the double decomposition of inorganic salts