Definition of "estimator" [es•ti•ma•tor]

• A person who estimates, especially one who estimates costs (noun)
• A function of a random sample of a population used to estimate some parameter of the whole population (noun)

Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License

• "Law Number VIII: The most unsuccessful four years in the education of a cost-estimator is fifth grade arithmetic."
• "However, as far as I can see, the estimator is the ordinal LS estimator, which indeed is optimal under various criteria."
• "Ask if your company has this kind of estimator and make sure you take advantage of flexible spending accounts."