To exchange mutually or reciprocally; put each of in the place of the other; give and take in reciprocity: as, to interchange commodities; to interchange compliments or duties.To cause to follow one another alternately: as, to interchange cares with pleasures.To change reciprocally; succeed alternately.n. The act of exchanging reciprocally; the act or process of giving and receiving with reciprocity: as, an interchange of civilities or kind offices.n. Alternate succession: as, the interchange of light and darkness.n. Synonyms See exchange.