Usually means: Measure of joint variability between.
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We found 30 dictionaries that define the word covariance:

General (15 matching dictionaries)
  1. covariance: Merriam-Webster
  2. covariance: Oxford Learner's Dictionaries
  3. covariance: American Heritage Dictionary of the English Language
  4. covariance: Collins English Dictionary
  5. covariance: Vocabulary.com
  6. Covariance, covariance: Wordnik
  7. covariance: Wiktionary
  8. covariance: Webster's New World College Dictionary, 4th Ed.
  9. covariance: Infoplease Dictionary
  10. covariance: Dictionary.com
  11. Covariance (disambiguation), Covariance: Wikipedia, the Free Encyclopedia
  12. covariance: Rhymezone
  13. covariance: FreeDictionary.org
  14. covariance: Mnemonic Dictionary
  15. covariance: TheFreeDictionary.com

Business (7 matching dictionaries)
  1. MoneyGlossary.com (No longer online)
  2. covariance: Webster's New World Finance & Investment Dictionary
  3. INVESTORWORDS (No longer online)
  4. Covariance: bizterms.net
  5. Covariance: Investopedia
  6. Covariance: Financial dictionary
  7. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)
  1. covariance: Encyclopedia

Medicine (2 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. covariance: Medical dictionary

Science (3 matching dictionaries)
  1. Covariance: Eric Weisstein's World of Mathematics
  2. Covariance: Extragalactic Astronomy
  3. covariance: PlanetMath Encyclopedia

Tech (2 matching dictionaries)
  1. Glossary of Meteorology (No longer online)
  2. Lake and Water Word Glossary (No longer online)

(Note: See covariances as well.)

Definitions from Wiktionary (covariance)

noun:  (statistics) A statistical measure defined as scriptstyle operatorname Cov(X,Y)= operatorname E((X-μ)(Y-ν)) given two real-valued random variables X and Y, with expected values scriptstyle E(X),=,μ and scriptstyle E(Y),=,ν.
noun:  (object-oriented programming) The conversion of data types from wider to narrower in certain situations.

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