Definition of mantissa in English:

mantissa

noun

  • 1Mathematics
    The part of a logarithm after the decimal point.

    • ‘Sharp and completely accurate visions of hexadecimal mantissas and binary fractions floated about my head, along with the sure and certain knowledge of how to convert them to something more useful.’
    • ‘By choosing appropriate mantissas and exponents, we can increase the resolution at shallower depths and degrade it at greater depths.’
    • ‘The mantissa provides the significant information, or digits, and the exponent provides a scaling factor that shows how big the number is.’
  • 2Computing
    The part of a floating-point number which represents the significant digits of that number.

    • ‘If you recall, run-of-the-mill DSPs typically store numbers as a floating-point, 24-bit mantissa and an 8-bit exponent.’
    • ‘Double-precision fixed-point would employ two times 24, or a 48-bit word length; double-precision floating-point would use a two times 32, or 64-bit mantissa.’
    • ‘In these cases, the 24-bit fixed standard is equivalent to the 24-bit mantissa, plus 8-bit exponent used in the 32-bit, floating-point version.’

Origin

Mid 17th century: from Latin, literally makeweight, perhaps from Etruscan.

Pronunciation:

mantissa

/manˈtɪsə/