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plural estimators
A person who estimates, especially one who estimates costs quotations examples
The Æstimators of the Valor of everie Townes Teinds.
1596, James Melville, The Diary of Mr James Melvill. 1556-1601., Edinburgh, published 1829, page 225
(mathematics) A function of a random sample of a population used to estimate some parameter of the whole population examples