Frequency.
One that repeats itself over time.
AC stands for "alternating current," which is a type of electrical current that periodically changes direction. It is not a wave but can be represented by a waveform, which shows how the voltage or current changes over time in a repetitive manner. So, AC is not a wave itself, but it produces a waveform when graphed.
The periodic time of an alternating-current system is the is the time in seconds that has to elapse before the waveform repeats itself from its beginning to the end. It is denoted as the Period (T).
A sequence of events that repeats itself is known as a cycle.
The symbol of the wavelength is the lowercase Greek letter "lambda" = λ.
Something that repeats it's self is redundant.
The definition of a pattern that repeats itself is recurring and the correct term is recurrence. This can also be said to be monotonous
History Repeats Itself - 1910 was released on: USA: 10 May 1910
It means - history repeats itself
Repetitive motion
An algorithm.
The frequency in cycles per second of a waveform is determined by the rate at which the cycle repeats itself. This is influenced by factors such as the speed of the oscillating source and the wavelength of the wave. In mathematical terms, frequency is the inverse of the period of the waveform.