Usually means: Fractional part of logarithm value.
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We found 34 dictionaries that define the word Mantissa:

General (22 matching dictionaries)
  1. mantissa: Merriam-Webster
  2. mantissa: Oxford Learner's Dictionaries
  3. mantissa: American Heritage Dictionary of the English Language
  4. mantissa: Collins English Dictionary
  5. mantissa: Vocabulary.com
  6. mantissa: Wordnik
  7. mantissa: Wiktionary
  8. mantissa: Webster's New World College Dictionary, 4th Ed.
  9. mantissa: The Wordsmyth English Dictionary-Thesaurus
  10. mantissa: Infoplease Dictionary
  11. mantissa: Dictionary.com
  12. mantissa: Online Etymology Dictionary
  13. Mantissa (band), Mantissa (floating point number), Mantissa (logarithm), Mantissa (novel), Mantissa: Wikipedia, the Free Encyclopedia
  14. Mantissa: Online Plain Text English Dictionary
  15. mantissa: Webster's Revised Unabridged, 1913 Edition
  16. mantissa: Rhymezone
  17. Mantissa: AllWords.com Multi-Lingual Dictionary
  18. mantissa: Stammtisch Beau Fleuve Acronyms
  19. mantissa: FreeDictionary.org
  20. mantissa: The Phrontistery - A Dictionary of Obscure Words
  21. mantissa: Mnemonic Dictionary
  22. mantissa: TheFreeDictionary.com

Business (2 matching dictionaries)
  1. mantissa: Glossary of research economics
  2. BusinessDictionary.com (No longer online)

Computing (3 matching dictionaries)
  1. mantissa: Free On-line Dictionary of Computing
  2. mantissa: CCI Computer
  3. mantissa: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Science (4 matching dictionaries)
  1. Mantissa: Eric Weisstein's World of Mathematics
  2. mantissa: MATH SPOKEN HERE!
  3. Mantissa: Extragalactic Astronomy
  4. mantissa, mantissa: PlanetMath Encyclopedia

Slang (1 matching dictionary)
  1. Mantissa: Urban Dictionary

Tech (1 matching dictionary)
  1. Rane Professional Audio Reference (No longer online)

(Note: See mantissas as well.)

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Definitions from Wiktionary (mantissa)

▸ noun:  (obsolete) A minor addition to a text.
▸ noun:  (mathematics) The part of a common logarithm after the decimal point, the fractional part of a logarithm.
▸ noun:  (mathematics, computing) The significand; that part of a floating-point number or number in scientific notation that contains its significant digits.

Similar:
fixed-point part, oddment, marginalia, paragraph, note, side note, line, annotation, infix, subfix, more...

Opposite:
exponent, characteristic, integer part

Types:
decimal, binary, octal, hexadecimal, more...

Adjectives:
bit, digit, positive, normalized, same, fractional, next, negative, smallest, characteristic, point
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Similar:
fixed-point part, oddment, marginalia, paragraph, note, side note, line, annotation, infix, subfix, more...

Opposite:
exponent, characteristic, integer part

Types:
decimal, binary, octal, hexadecimal, more...

Adjectives:
bit, digit, positive, normalized, same, fractional, next, negative, smallest, characteristic, point



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