Search Result for "underestimation": 
Wordnet 3.0

NOUN (1)

1. an estimation that is too low; an estimate that is less than the true or actual value;
[syn: underestimate, underestimation, underrating, underreckoning]



WordNet (r) 3.0 (2006):

underestimation
    n 1: an estimation that is too low; an estimate that is less
         than the true or actual value [syn: underestimate,
         underestimation, underrating, underreckoning]