THESAURUS
concerning
about, against, anent, apropos of, as for, as regards, as respects, as to, in connection with, in point of, in re, in reference to, in regard to, in relation to, in relation with, in respect to, of, on, pertaining to, pertinent to, re, referring to, regarding, relating to, relative to, respecting, speaking of, touching, upon, with regard to, with respect to
ROGET THESAURUS
concerning
Relation
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.