1. To render neutral; to reduce to a state of neutrality. So here I am neutralized again. (Sir W. Scott)
2. (Science: chemistry) 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.
3. 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. Counter citations that neutralize each other. (E. Everett)
Origin: Cf. F. Neutraliser.