Estimate  —n. 1 approximate judgement, esp. Of cost, value, size, etc. 2 statement of approximate charge for work to be undertaken. —v. (-ting) (also absol.) 1 form an estimate or opinion of. 2 (foll. By that) make a rough calculation. 3 (often foll. By at) form an estimate; adjudge.  estimator n. [latin aestimo fix the price of]