1characterized by or tending to concession:we must look for a more concessive approach
2 Grammar (of a preposition or conjunction) introducing a phrase or clause denoting a circumstance which might be expected to preclude the action of the main clause, but does not (e.g. in spite of, although).
(of a phrase or clause) introduced by a concessive preposition or conjunction.
concessive in other Oxford dictionaries
Definition of concessive in the US English dictionary