This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. The mathematical representation of a wave, especially a graph obtained by plotting a characteristic of the wave against time.

n. The shape of a wave function represented by a graph showing some dependent variable as function of an independent variable.

n. The shape of a physical wave, such as sound, electric current or electromagnetic radiation, or its representation obtained by plotting a charecteristic of the phenomenon (such as voltage) versus another variable, often time.

n. the shape of a wave illustrated graphically by plotting the values of the period quantity against time

"I used the waveform from a digitized cello tone as the basis waveform for the oscillators."

wave    undulation   

modulation    amplitude    voltage    amplifier    analog    comparator    excitation    impedance    bandwidth    baseband