from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The decimal part of a logarithm. In the logarithm 2.95424, the mantissa is 0.95424.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A minor addition to a text.
  • n. The part of a common logarithm after the decimal point, the fractional part of a logarithm.
  • n. The significand; that part of a floating-point number or number in scientific notation that contains its significant digits.

from the GNU version of the Collaborative International Dictionary of English

  • n. The decimal part of a logarithm, as distinguished from the integral part, or characteristic.

from The Century Dictionary and Cyclopedia

  • n. A supplementary treatise; a lesser work following one on the same subject.
  • n. The decimal part of a logarithm: so called as being additional to the characteristic or integral part.
  • n. [capitalized] In zoology, a genus of mollusks.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the positive fractional part of the representation of a logarithm; in the expression log 643 = 2.808 the mantissa is .808


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin, makeweight, perhaps of Etruscan origin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin mantissa, of unknown origin (said by Festus to be a loanword from Etruscan).


  • Even when the mantissa can be expressed with a single base-10 digit, like .4, it may not be the case in base 2.

    Exponential Growth in Physical Systems « Climate Audit

  • -- The peripatetic Alexander of Aphrodisias who fought fatalism in his [Greek: Peri heimarmenês], at the beginning of the third century, and who violently attacked the charlatanism and cupidity of the astrologers in another book (_De anima mantissa_, p. 180, 14, Bruns), formulated the contradiction in the popular beliefs of his time (_ibid. _, p. 182, 18):

    The Oriental Religions in Roman Paganism

  • The frexp intrinsic function has been updated to return a mantissa in the range of Mixed RSS Feed

  • When ColdFusion was generating the ID for the input, it was happily smashing the mantissa of the points together.

    O'Reilly News and Commentary

  • I decided to take the mantissa of the latitude and longitude points (everything to the right of the decimal point) and combine them together to get a unique id.

    O'Reilly News and Commentary

  • · Exponents are entered and displayed in the same base as the mantissa.

    Softpedia - Windows - All

  • Int64 and UInt64 types are not available yet because JavaScript 64-bit (8 bytes) float point number have only 52-bit mantissa which means that it is not possible to work with 64-bit whole numbers properly.

    The Code Project Latest Articles

  • Programming & Design what is mantissa and exponent in binary representation of real numbers? how would i get an income source without spending any cost for tutorials or any materials?

    Yahoo! Answers: Latest Questions

  • (link) Whereas mine only rhymes well with math things, mantissa and abscissa and like that.

    mrissa: Also

  • As long as I have the editor's attention I will ask if readers know of another word, besides ` mantissa '(or mantisa), that is believed to derive from both Welsh and Etruscan?

    VERBATIM: The Language Quarterly Vol V No 1


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