Definition of estimation noun from the Oxford Advanced American Dictionary



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  1. 1 [singular] a judgment or an opinion about the value or quality of someone or something Who is the best candidate in your estimation? Since he left his wife he's certainly gone down in my estimation (= I have less respect for him). She went up in my estimation (= I have more respect for her) when I discovered how much charity work she does.
  2. 2[countable] a judgment about the levels or quantity of something Estimations of our total world sales are around 50 million.
See the Oxford Advanced Learner's Dictionary entry: estimation