Dictionary.net

a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons

a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons

One of the electrified particles into which a gas, or a substance in solution, is broken up under the action of electricity.

A group of atoms or parts of molecules carrying a charge of electricity and constituting one of the elements of an electrolyte. The ions charged with negative electricity which are evolved at the positive pole (anode) are called anions; those charged with positive electricity, at the negative pole (cathode), cations.

One of the elements which appear at the poles, when a body is subjected to electro-chemical decomposition.

Any one of the elements which are evolved out of a particular substance by the voltaic current, and which appear at the poles of the battery.

An element set free by electrolysis.

A constituent of any salt, acid, or base formed when dissolved in water which is charged with electricity. When the charge is negative, the ion is an anion; when it is positive, the ion is a cation. When sodium chlorid dissolves in water it dissociates into its positive ion (cation) Na and its negative ion (anion) CI.