The Collaborative International Dictionary of English v.0.48:

Interchange \In`ter*change"\, v. t. [imp. & p. p.
   Interchanged; p. pr. & vb. n. Interchanging.] [OE.
   entrechangen, OF. entrechangier. See Inter-, and Change.]
   [1913 Webster]
   1. To put each in the place of the other; to give and take
      mutually; to exchange; to reciprocate; as, to interchange
      places; they interchanged friendly offices and services.
      [1913 Webster]

            I shall interchange
            My waned state for Henry's regal crown. --Shak.
      [1913 Webster]

   2. To cause to follow alternately; to intermingle; to vary;
      as, to interchange cares with pleasures.
      [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "interchanged":
   changeable, commutable, commutative, convertible, equal,
   equalizing, equivalent, even, exchanged, give-and-take,
   interchangeable, mutual, permutable, reciprocal, reciprocating,
   reciprocative, retaliatory, returnable, standard, swapped,
   switched, traded, transposed