Magnitude may refer to:

In mathematics:

  • Magnitude (mathematics), the relative size of an object
  • Magnitude (vector), a term for the size or length of a vector
  • Scalar (mathematics), a quantity defined only by its magnitude
  • Euclidean vector, a quantity defined by both its magnitude and its direction
  • Order of magnitude, the class of scale having a fixed value ratio to the preceding class

In astronomy:

  • Magnitude (astronomy), a measure of brightness and brightness differences used in astronomy
    • Apparent magnitude, the apparent brightness of a celestial object as observed from Earth
    • Absolute magnitude, the brightness of a celestial object corrected to a standard luminosity distance
    • Photographic magnitude, the brightness of a celestial object corrected for photographic sensitivity, symbol mpg
  • Magnitude of eclipse or geometric magnitude, the size of the eclipsed part of the Sun during a solar eclipse or the Moon during a lunar eclipse

As an earthquake unit of measure:

  • Richter magnitude scale, a measure of the energy of an earthquake
  • Moment magnitude scale, an alternative to the Richter scale for measuring earthquakes
  • Surface wave magnitude

In popular culture:

  • Magnitude (Community), a recurring character from the television series Community

Famous quotes containing the word magnitude:

    Government is either organized benevolence or organized madness; its peculiar magnitude permits no shading.
    John Updike (b. 1932)

    Although a man may lose a sense of his own importance when he is a mere unit among a busy throng, all utterly regardless of him, it by no means follows that he can dispossess himself, with equal facility, of a very strong sense of the importance and magnitude of his cares.
    Charles Dickens (1812–1870)

    Sometimes you’re overwhelmed when a thing comes, and you do not realize the magnitude of the affair at that moment. When you get away from it, you wonder, did it really happen to you.
    Marian Anderson (1902–1993)