1. Linear is in the manner of a straight line. Thus, linear response is indicated when one quantity varies directly with another; the graph of this response is a straight line. Example, one of constant slope
2. In a straight line.
3.The characteristic of a signal that is a replica of another. Example, an amplifier output signal of the same waveform as that of the input signal.
See also, LINEAR CIRCUIT, LINEAR RESPONSE, Linear Amplifier