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.]
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   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.
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            I shall interchange
            My waned state for Henry's regal crown. --Shak.
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   2. To cause to follow alternately; to intermingle; to vary;
      as, to interchange cares with pleasures.
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