Electronic mail and Virtual reality

Electronic mail noun - (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in.

Virtual reality and electronic mail are semantically related. In some cases you can use "Virtual reality" instead a noun phrase "Electronic mail".

Virtual reality noun - A hypothetical three-dimensional visual world created by a computer; user wears special goggles and fiber optic gloves etc., and can enter and move about in this world and interact with objects as if inside it.

Electronic mail and virtual reality are semantically related. Sometimes you can use "Electronic mail" instead a noun phrase "Virtual reality".