(1):
(v. t.) To render inert or imperceptible the peculiar affinities of, as a chemical substance; to destroy the effect of; as, to neutralize an acid with a base.
(2):
(v. t.) To render neutral; to reduce to a state of neutrality.
(3):
(v. t.) To destroy the peculiar or opposite dispositions of; to reduce to a state of indifference inefficience; to counteract; as, to neutralize parties in government; to neutralize efforts, opposition, etc.