Coun′ter‐vail″ (koun′t?r–v?l″), v. t. [imp. & p. p.Countervailed (–v?ld); p. pr. & vb. n.Countervailing.] [OF. contrevaloir; contre (L. contra) + valoir to avail, fr. L. valere to be strong, avail. See Vallant.] To act against with equal force, power, or effect; to thwart or overcome by such action; to furnish an equivalent to or for; to counterbalance; to compensate.
Upon balancing the account, the profit at last will hardly countervail the inconveniences that go allong with it.
L'Estrange.