• noun an atom or a group of atoms that has obtained an electric charge by gaining or losing one or more electrons


  • Atom which has an electric charge by virtue of receiving more electrons than usual, making it a negative ion, or losing one or more to give it a positive charge. Material in strong electric fields or at high temperatures is especially likely to be ionised, as in the Earth’s outer atmosphere or the insides of stars, where neutral atoms tend to be the exception rather than the rule.

Cars & Driving

  • noun an electrically charged particle formed by losing or gaining electrons; particles of this type make a solution of certain chemicals a conductor of electricity


  • acronym forInstitute for Optimum Nutrition
    (written as ION)