electron: Meaning and Definition of

e•lec•tron

1. Also calledan elementary particle that is a fundamental constituent of matter, having a negative charge of 1.602 × 10 coulombs, a mass of 9.108 × 10 kilograms, and spin of , and existing independently or as the component outside the nucleus of an atom.
2. a unit of charge equal to the charge on one electron.