We found 34 dictionaries that define the word estimation:

General (26 matching dictionaries)

1. estimation: Merriam-Webster
2. estimation: Oxford Learner's Dictionaries
3. estimation: American Heritage Dictionary of the English Language
4. estimation: Collins English Dictionary
5. estimation: Vocabulary.com
6. Estimation, estimation: Wordnik
7. estimation: Cambridge Advanced Learner's Dictionary
8. estimation: Wiktionary
9. estimation: Webster's New World College Dictionary, 4th Ed.
10. estimation: The Wordsmyth English Dictionary-Thesaurus
11. estimation: Infoplease Dictionary
12. Estimation, estimation: Dictionary.com
13. estimation: Online Etymology Dictionary
14. estimation: Cambridge Essential American English Dictionary
15. Estimation (disambiguation), Estimation (project management), Estimation: Wikipedia, the Free Encyclopedia
16. Estimation: Online Plain Text English Dictionary
17. estimation: Webster's Revised Unabridged, 1913 Edition
18. estimation: Rhymezone
19. estimation: AllWords.com Multi-Lingual Dictionary
20. estimation: Webster's 1828 Dictionary
21. estimation: FreeDictionary.org
22. estimation: Mnemonic Dictionary
23. estimation: TheFreeDictionary.com
24. estimation: Longman Dictionary of Contemporary English

Art (1 matching dictionary)

25. Shakespeare Glossary (No longer online)

Business (2 matching dictionaries)

26. estimation: Glossary of research economics
27. estimation: Legal dictionary

Computing (1 matching dictionary)

28. estimation: Encyclopedia

Medicine (2 matching dictionaries)

29. online medical dictionary (No longer online)
30. estimation: Medical dictionary

Science (2 matching dictionaries)

31. Agricultural Thesaurus and Glossary (No longer online)
32. Statistics (No longer online)

(Note: See estimations as well.)

Definitions from Wiktionary ( ) ▸ noun:  The process of making an estimate. ▸ noun:  The amount, extent, position, size, or value reached in an estimate. ▸ noun:  Esteem or favourable regard. Similar: estimate, approximation, appraisal, idea, calculation, measurement, assessment, estimator, quantification, extrapolation, more... Opposite: certainty, precision, exactness, accuracy, definiteness Types: guesstimate, ballpark, rule of thumb, more... Phrases: parameter estimation, Motion estimation, statistical estimation, Interval estimation, Point estimation, more... Adjectives: quantitative, high, own, public, accurate, maximum, popular, over, direct, statistical, general Colors:     pale blue,     light gray,     soft yellow,     mint green,     lavender, more... ▸ Word origin ▸ Words similar to estimation ▸ Usage examples for estimation ▸ Idioms related to estimation ▸ Wikipedia articles (New!) ▸ Popular adjectives describing estimation ▸ Words that often appear near estimation ▸ Rhymes of estimation ▸ Invented words related to estimation