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scale, based on seismic moment, supersedes the Richter scale Richter magnitude scale, the energy of an earthquake, superseded by Moment scale Surface-wave magnitude, based on Rayleigh surface wave measurement through heat conduction Seismic intensity scales, the local severity of a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 "Magnitude", a song by Moka Only from the 2001 album Lime Green
Animals Magnitude (horse), an American thoroughbred racehorse