overestimation
ove·res·ti·mation
noun
1.
2.
a calculation that results in an estimate that is too high
Origin
From over- + estimation.
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.