The Collaborative International Dictionary of English v.0.48:

Interchange \In`ter*change"\, n. [Cf. OF. entrechange.]
   [1913 Webster]
   1. The act of mutually changing; the act of mutually giving
      and receiving; exchange; as, the interchange of civilities
      between two persons. "Interchange of kindnesses." --South.
      [1913 Webster]

   2. The mutual exchange of commodities between two persons or
      countries; barter; commerce. --Howell.
      [1913 Webster]

   3. Alternate succession; alternation; a mingling.
      [1913 Webster]

            The interchanges of light and darkness. --Holder.
      [1913 Webster]

            Sweet interchange
            Of hill and valley, rivers, woods, and plains.
                                                  --Milton.
      [1913 Webster]

   4. An intersection between highways, having two or more
      levels and a series of connecting roadways so that traffic
      on one highway may pass over or under the other highway
      without crossing through the line of traffic, and vehicles
      may pass from one highway to the other while traffic on
      both highways continues uninterrupted. A common
      interchange is the cloverleaf.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

cloverleaf \cloverleaf\ n.
   a highway interchange between two roads in which the
   connecting road pattern resembles a four-leaf clover, and
   which allows moving from one road to another without
   left-hand turns. One road passes over the other, and the exit
   from one highway and entrance into the second highway
   proceeds from the right-hand lane in all directions.
   [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

cloverleaf
    n 1: an interchange that does not require left-hand turns