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.-to cause to follow alternately; to intermingle; to vary; as, to interchange cares with pleasures.-to make an interchange; to alternate.-the act of mutually changing; the act of mutually giving and receiving; exchange; as, the interchange of civilities between two persons.-the mutual exchange of commodities between two persons or countries; barter; commerce.-alternate succession; alternation; a mingling.