Ionize is a term that describes the process of transforming a neutral atom or molecule into an ion by adding or removing one or more electrons. Some synonyms for ionize include electrify, charge, and disassociate. Electrify generally refers to the process of giving an electric charge to a body or substance, while charge refers to the action of making something electrically positive or negative. Disassociate, on the other hand, commonly means to break apart a molecule into smaller components, which may or may not be ions. Other synonyms for ionize include catalyze, activate, and excite, all of which describe processes that result in the production of ions or ion-like particles.