Mantissa definition

măn-tĭsə
The decimal part of a logarithm to base 10 as distinguished from the integral part (called the characteristic)

.7193 is the mantissa of the logarithm 4.7193

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The decimal part of a logarithm. In the logarithm 2.95424, the mantissa is 0.95424.
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The definition of a mantissa is the part of a number located after a decimal point.

An example of mantissa is 234 in the number 1101.234.

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(mathematics) The part of a common logarithm after the decimal point, the fractional part of a logarithm.
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(mathematics, computing, proscribed) The significand; that part of a floating-point number or number in scientific notation that contains its significant digits.
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The part of a logarithm to the base ten that is to the right of the decimal point. For example, if 2.749 is a logarithm, .749 is the mantissa.
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Other Word Forms

Noun

Singular:
mantissa
Plural:
mantissae

Origin of mantissa

  • Latin makeweight perhaps of Etruscan origin

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Latin mantissa, mantīsa, of unknown origin (said by Festus to be a loanword from Etruscan, but it may actually be from Celtic, possibly through Etruscan mediation).

    From Wiktionary