'Estimator' definitions:

Definition of 'estimator'

From: WordNet
noun
An expert at calculation (or at operating calculating machines) [syn: calculator, reckoner, figurer, estimator, computer]

Definition of 'Estimator'

From: GCIDE
  • Estimator \Es"ti*ma`tor\, n. [L. aestimator.] One who estimates or values; a valuer. --Jer. Taylor. Estivate Estival