Magnitude

Magnitude may refer to:

Mathematics

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

Astronomy

 * Absolute magnitude, the brightness of a celestial object corrected to a standard luminosity distance
 * Apparent magnitude, the calibrated apparent brightness of a celestial object
 * Instrumental magnitude, the uncalibrated apparent magnitude of a celestial object
 * Limiting magnitude, the faintest apparent magnitude of a celestial body that is detectable or detected by a given instrument.
 * Magnitude (astronomy), a measure of brightness and brightness differences used in astronomy
 * 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
 * Photographic magnitude, the brightness of a celestial object corrected for photographic sensitivity, symbol mpg
 * Visual magnitude, the brightness of a celestial object in visible, symbol mv

Seismology

 * Seismic magnitude scales, the energy in an earthquake, measures include:
 * Moment magnitude scale, based on seismic moment, supersedes the Richter scale
 * Richter magnitude scale, the energy of an earthquake, superseded by Moment scale
 * Surface-wave magnitude, based on Rayleigh surface wave measurement through heat conduction
 * Seismic intensity scales, the local severity of a quake

Arts and media

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