“rapport n.: A sympathetic or harmonious relationship or state of mutual understanding. The word was introduced into psychology by the Viennese physician Franz Anton Mesmer (1734-1815), and the French psychologist and neurologist Pierre Janet (1859-1947) confined its meaning specifically to the relationship between a hypnotist and a hypnotized subject; then Sigmund Freud (1856-1939) eventually widened its meaning and described it as the prototype (2) of the transference.
[From French rapporter, to bring back, from re-again and apportare, to carry to, from Latin apportare to bring to, from, ad to + portare to bring or carry]”
Excerpted from: Colman, Andrew M., ed. Oxford Dictionary of Psychology. New York: Oxford University Press, 2003.