Lewis & Short

transmūtātĭo, ōnis, f. [transmuto].

  1. I. In gen., a changing, Vulg. Jacob. 1, 17.
  2. II. In partic., a shifting, transposition of letters (post-Aug.; cf.: transpositio, commutatio), Quint. 1, 5, 39; 9, 4, 89.