square wave

noun Mathematics, Physics.
a graph, function, vibration, etc., that is periodic and equal to one constant on one half of the period and a different constant, which may be zero, on the other half.

Origin:
1930–35

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World English Dictionary
square wave
 
n
an oscillation, for example in voltage pulse, that alternates between two fixed values with a negligible transition time between the two, giving a rectangular waveform

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Example sentences
Square wave voltage waveforms begin to look more sinusoidal due to finite bandwidth.
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