Electronic mail and Information superhighway

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.

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

Information superhighway noun - An extensive electronic network (such as the internet) used for the rapid transfer of sound and video and graphics in digital form.

Electronic mail and information superhighway are semantically related. You can use "Electronic mail" instead a noun phrase "Information superhighway".