In accord, harmony, or sympathy; having a mutual, esp. a private, understanding; of a hypnotic subject, being in such a mental state as to be especially subject to the influence of a particular person or persons. [Webster 1913 Suppl.]
en rapport, adv. (usu. foll. by with) in harmony or rapport.
Etymology:
F: see RAPPORT
N relation, bearing, reference, connection, concern, cognation, correlation, analogy, similarity, affinity, homology, alliance, homogeneity, association, approximation, filiation, interest, relevancy, dependency, relationship, relative position, comparison, ratio, proportion, link, tie, bond of union, relative, correlative, cognate, relating to, relative to, in relation with, referable or referrible to, belonging to, appurtenant to, in common with, related, connected, implicated, associated, affiliated, allied to, en rapport, in touch with, approximative, approximating, proportional, proportionate, proportionable, allusive, comparable, in the same category, like, relevant, applicable, equiparant, relatively, pertinently, thereof, as to, as for, as respects, as regards, about, concerning, anent, relating to, as relates to, with relation, with reference to, with respect to, with regard to, in respect of, while speaking of, a propos of, in connection with, by the way, by the by, whereas, for as much as, in as much as, in point of, as far as, on the part of, on the score of, quoad hoc, pro re nata, under the head of, of, in the matter of, in re, thereby hangs a tale.
egg en cocotte, en, en bloc, en clair, en deshabille, en famille, en garde, en masse, en passant, en route, en route to, filet de boeuf en croute, lev'82e en masse, levy en masse, mise en scene, rapport