Etymology: "constructor of military engines", from Old French engigneor, from Late Latin ingeniare, from Latin ingenium, "inborn qualities, talent".

1. An engineer who engages in research, design, production, operation, and the maintenance of electric power production and transmission facilities, telecommunication systems, or microelectronic devices and systems.
2. An engineer whose training includes a degree in electrical engineering from an accredited college or university, or someone who has comparable knowledge and experience, to prepare him or her for maintaining the generation, transmission, and utilization of electric energy.
3. A trained specialist in electrical systems, especially those which power and control machines or are involved in communications.

Someone who is skilled in the field of electronic engineering or the branch of engineering that deals with the design, fabrication, and operation of circuits, electronic devices, and systems.

An engineer whose training includes a degree in electronic engineering from an accredited college or university, a degree in electrical engineering with a major in electronics, or comparable knowledge and experience as required for working with electronic circuits and tools.

A person who deals with the design, construction, and uses of machines: "James was a mechanical engineer who was involved in modernizing machines."