Definitions for "Regressor"
In a linear regression model, an independent -- or right-hand-side -- variable. That is, one of the variables that is being used to explain another.
A mapping from unlabeled instances to a value within a predefined metric space (e.g., a continuous range).
A predictive model where the label takes on a continuous value. Regressors are very similar to classifiers.
Keywords:  see
See regression.