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Selectivity is a measure of the performance of a radio receiver to respond only to the tuned transmission (or station) and reject other signals nearby - such as another broadcast on an adjacent channel.

Selectivity is usually measured as a ratio in dBss, comparing the power of the signal received against that of a similar signal on another frequency. If the signal is at the adjacent channel of the selected signal, this measurement is also known as Adjacent Channel Rejection Ratio (ACRR).