Look up magnitude in Wiktionary, the free dictionary.

Magnitude may refer to:

In mathematics:

• Magnitude (mathematics), the relative size of a mathematical 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 m_pg
• 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, a recurring character from the television series Community

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