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Definition of Ion exchange
1. Noun. A process in which ions are exchanged between a solution and an insoluble (usually resinous) solid; widely used in industrial processing.
Medical Definition of Ion exchange
1. Reversible chemical reaction between a solid, often an ion exchange resin, and a fluid whereby ions may be exchanged from one substance to another. This technique is used in water purification, in research, and in industry. (12 Dec 1998)