Emily Dickinson Lexicon

ME-TATH'E-SIS, n. [Gr. μεταθεσις; μετα, over, and τιθημι, to set.]

1. Transposition; a figure by which the letters or syllables of a word are transposed; as pistris for pristis. Encyc.
2. In medicine, a change or removal of a morbid cause, without expulsion. Coxe. Encyc.