Electronics Definition Electronics is the branch of science that deals with the study of flow and control of electrons electricity and the study of their behavior and effects in vacuums, gases, and semiconductors, and with devices using such electrons..Electronic definition, of or relating to electronics or to devices, circuits, or systems developed through electronics. See more..Electronic definition . especially of equipment , using, based on, or used in a system of operation that involves the. Learn more..Define electronic. electronic synonyms, electronic pronunciation, electronic translation, English dictionary definition of electronic. adj. . Of or relating to electrons. . Of, based on, operated by, or otherwise involving the controlled conduction of electrons or other charge carriers, .