Real Dictionary

electronics
uncountable noun: Electronics is the technology of using transistors and silicon chips, especially in devices such as radios, televisions, and computers.

electronics in American English
electronic equipment, systems, etc.
the science that deals with the behavior and control of electrons in vacuums and gases, and with the use of electron tubes, photoelectric cells, transistors, etc.
noun: the science dealing with the development and application of devices and systems involving the flow of electrons in a vacuum, in gaseous media, and in semiconductors

electronics in British English
noun: the science and technology concerned with the development, behaviour, and applications of electronic devices and circuits

electronics in Retail
noun: Electronics is the product category name for consumer goods that are powered by the flow of electrons, for example computers, point-and-shoot cameras, and cellphones.