"One complete positive and one complete negative alternation of a signal" is the definition of which of the following terms?

The definition "one complete positive and one complete negative alternation of a signal" accurately describes a cycle. In the context of waveform signals, a cycle is the fundamental unit that represents the full variation of the signal over time. It encompasses both the upward (positive) and downward (negative) movements of the waveform, capturing the entire pattern of oscillation that repeats itself in regular intervals.

This concept is pivotal in understanding waveforms in electronics and communications, as it determines key characteristics like frequency, which indicates how many cycles occur in a second, and period, which is the duration of one cycle. Each of these terms relates to cycles but does not represent the complete definition provided in the question. Wavelength, on the other hand, refers to the physical length of a single cycle in a wave and is not synonymous with the complete alternation described.