predictor

[pri-dik-ter]
noun
1.
a person or thing that predicts.
2.
Mathematics. a formula for determining additional values or derivatives of a function from the relationship of its given values.

Origin:
1645–55; < Medieval Latin praedictor. See predict, -tor

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World English Dictionary
predictor (prɪˈdɪktə)
 
n
1.  a person or thing that predicts
2.  an instrument, used in conjunction with an anti-aircraft gun, that determines the speed, distance, height, and direction of hostile aircraft
3.  statistics a more modern term for independent variable

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Example sentences
The anatomy of the scleral rings may not be a clear-cut predictor of behavior.
The science of this sort of thing may be doubted, especially as a predictor of
  future opinion.
So it's easy to imagine that volatility should also be a good predictor of
  financial crises, when the biggest corrections occur.
Various groups have shown that this early popularity can be a good predictor of
  a story's later spread.
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