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What do you mean by the term attenuation

What do you mean by the term attenuation?

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Attenuation is the reduction in intensity and amplitude of a signal. Signals might attenuate exponentially by transmission via a medium or by increments computed in electronic circuitry or set by variable controls. Attenuation is a significant property in ultrasound and telecommunications applications because of its significance in finding out the signal strength as a function of distance. Attenuation is generally measured in units of decibels per unit length of medium (dB/cm, dB/km and so on) and is symbolized by the attenuation coefficient of the medium.

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