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    mag·ni·tude
    [ˈmaɡnəˌto͞od]
    noun
    magnitude (noun) · magnitudes (plural noun)
    1. the degree of brightness of a star. The magnitude of an astronomical object is now reckoned as the negative logarithm of the brightness; a decrease of one magnitude represents an increase in brightness of 2.512 times. A star with an apparent magnitude of six is barely visible to the naked eye. See also apparent magnitude, absolute magnitude.
      "the brightest stars have the lowest magnitudes"
      • the class into which a star falls by virtue of its brightness:
        "a star of the fifth magnitude"
      • a difference of one on a scale of brightness, treated as a unit of measurement:
        "a range of a tenth of a magnitude"
    Origin
    late Middle English (also in the sense ‘greatness of character’): from Latin magnitudo, from magnus ‘great’.
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