selectivity

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selectivity

[sə‚lek′tiv·əd·ē]
(analytical chemistry)
The ability of a type of method or instrumentation to respond to a specified substance or constituent and not to others.
(electronics)
The ability of a radio receiver to separate a desired signal frequency from other signal frequencies, some of which may differ only slightly from the desired value.
The inverse of the shape factor of a bandpass filter.