1. <hardware> An electronic or electromechanical device for entering data into a computer or a communications system and displaying data received. Early terminals were called teletypes, later ones VDUs. Typically a terminal communicates with the computer via a serial line.

2. <electronics> The end of a line where signals are either transmitted or received, or a point along the length of a line where the signals are made available to apparatus.

3. <electronics> Apparatus to send and/or receive signals on a line.