Definition of overestimation noun from the Oxford Advanced Learner's Dictionary

 

overestimation

 noun
noun
BrE BrE//ˌəʊvərestɪˈmeɪʃn//
 
; NAmE NAmE//ˌoʊvərestɪˈmeɪʃn//
 
[uncountable, countable]overestimation (of something)
 
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the act or result of estimating something to be larger, better, more important, etc. than it really is Revenue assumptions may be prone to overestimation. This can result in an overestimation of the risk.