discriminator

[dih-skrim-uh-ney-ter]
noun
1.
a person or thing that discriminates.
2.
Electronics. a circuit in which the output is a function of some variation of an input signal from a fixed characteristic.

Origin:
1820–30; < Late Latin; see discriminate, -tor

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World English Dictionary
discriminate
 
vb (when intr, foll by between or among)
1.  (intr; usually foll by in favour of or against) to single out a particular person, group, etc, for special favour or, esp, disfavour, often because of a characteristic such as race, colour, sex, intelligence, etc
2.  to recognize or understand the difference (between); distinguish: to discriminate right and wrong; to discriminate between right and wrong
3.  (intr) to constitute or mark a difference
4.  (intr) to be discerning in matters of taste
 
adj
5.  showing or marked by discrimination
 
[C17: from Latin discrīmināre to divide, from discrīmen a separation, from discernere to discern]
 
dis'criminately
 
adv
 
dis'criminator
 
n

discriminator (dɪˈskrɪmɪˌneɪtə)
 
n
1.  an electronic circuit that converts a frequency or phase modulation into an amplitude modulation for subsequent demodulation
2.  an electronic circuit that has an output voltage only when the amplitude of the input pulses exceeds a predetermined value

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Example sentences
The biggest price discriminator for working families is pregnancy coverage.
Context is often the final discriminator between features that look similar.
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