Which term describes the ability of a receiver to discriminate between multiple signals?

Selectivity is the measure of a receiver's ability to isolate and select a desired signal while rejecting interference from other signals on nearby frequencies. A radio with good selectivity uses filters to block out unwanted adjacent-channel traffic. A very common distractor is sensitivity. While selectivity deals with discriminating between multiple signals, sensitivity describes how well a receiver can pick up very weak signals. They are complementary but distinctly different characteristics.