Source : Webster's Revised Unabridged Dictionary (1913)

Rapport \Rap*port"\, n. [F., fr. rapporter to bring again or
   back, to refer; pref. re- re- + apporter to bring, L.
   apporter to bring, L. apportare. Cf. {Report}.]
   Relation; proportion; conformity; correspondence; accord.

         'T is obvious what rapport there is between the
         conceptions and languages in every country. --Sir W.
                                                  Temple.

   {En` rap`port"}[F.], in accord, harmony, or sympathy; having
      a mutual, especially a private, understanding; in
      mesmerism, in that relation of sympathy which permits
      influence or communication.

Source : WordNet®

rapport
     n 1: relation of mutual understanding or trust and agreement
          between people [syn: {resonance}]
     2: a feeling of sympathetic understanding [syn: {compatibility}]
     3: sympathetic compatibility [syn: {accord}]