n. The act of neutralizing; specifically, in chem., the process by which an acid and a base are so combined that the resulting compound has neither acid nor basic properties.n. An act of one or more nations imposing upon one of their number or upon another state a condition of permanent neutrality by ordaining that it shall not take part in any war into which the others may enter, in consideration for which its freedom from attack is usually guaranteed, as in the case of Switzerland in 1815, and Belgium since its separation from the Netherlands in 1830.n. An act of military powers agreeing that certain persons, property, and places, such as surgeons, chaplains, and the wounded, medical supplies, hospitals, and ambulances, shall be deemed neutral in war, and not subject to capture, etc., as was agreed by the Geneva Convention, 1864.n. More loosely, the act of securing by convention immunity for certain territory or waters from being made the scene of hostilities or of exclusive national maritime jurisdiction, as for the Black Sea, 1856, and for the Congo in Central Africa, 1885.n. The condition of immunity and restriction resulting from any of such acts. Also spelled neutralisation.n. In motor-racing, the act of neutralizing or rendering neutral. See neutralize, 4.