Lewis & Short

permūtātĭo, ōnis, f. [permuto].

  1. I. A changing, altering, change, alteration: magna rerum, Cic. Sest. 34, 73: temporum, id. Par. 6, 3, 51; Amm. 15, 3, 7: defensionis, Quint. 5, 13, 41: vicissitudinum, Vulg. Sap. 7, 18.
  2. II. An interchanging, barter, exchanging, exchange: mercium, Tac. G. 5, 4: partim emptiones, partim permutationes, Cic. Pis. 21, 48: haec res permutationem non recipit, Dig. 30, 1, 51: rerum, ib. 19, 5, 5: captivorum, Eutr. 2, 25; Gai. Inst, 3, 141.
    Of exchanging money, negotiating a bill of exchange, Cic. Fam. 3, 5, 4; id. Att. 5, 13, 2.
    1. B. A substitution.
      1. 1. In rhet., of one expression for another, permutation, Auct. Her. 4, 34, 46.
      2. 2. Of one person for another: similis si permutatio detur, Juv. 6, 653.