Толковый словарь английского языка Oxford English Reference - concessive

adj. 1 of or tending to concession. 2 Gram. a (of a preposition or conjunction) introducing a phrase or clause which might be expected to preclude the action of the main clause, but does not (e.g. in spite of, although). b (of a phrase or clause) introduced by a concessive preposition or conjunction. Etymology: LL concessivus (as concede)