overestimation

noun
over·es·ti·ma·tion | \ ˌō-vər-ˌe-stə-ˈmā-shən \
plural overestimations

Definition of overestimation 

: the act or an instance of estimating someone or something too highly The overestimation of the value of an advance in medicine can lead to more trouble than anyone can foresee … —Lewis Thomas … their wild overestimation of the reader's attention span … —Lev Grossman … potential problems of underestimation or overestimation of disease rates … —Tonny J. Oyana et al.

First Known Use of overestimation

1808, in the meaning defined above

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The first known use of overestimation was in 1808

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