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Webster 1913 Edition

Noun.

One who predicts; a foreteller.

Noun.

A foreteller; one who prophesies.

predictor ‎(plural predictors)

Something that anticipates, predicts or foretells.

The rainfall in April is a predictor for the number of mosquitoes in May.

The predictor in the traffic-light control circuit tries to figure out how fast to change the lights.
An independent variable.

predictor m ‎(plural predictores)