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The sensitivity of an electronic device, e.g., a communications system receiver, or detection device, e.g., PIN diode, is the minimum input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria.
Note 1: The signal input may be expressed as power in dBm or as field strength in microvolts per meter, with input network impedance stipulated.
Note 2: "Sensitivity" is sometimes improperly used as a synonym for "responsivity."
Source: from Federal Standard 1037C and from MIL-STD-188
