Magnitude

Magnitude may refer to:

In mathematics:

• Magnitude (mathematics), the relative size of an object
• Norm (mathematics), 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 calibrated apparent brightness of a celestial object
• Instrumental magnitude, the uncalibrated apparent magnitude of a celestial object
• 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
• Visual magnitude, the brightness of a celestial object in visible, symbol m_v
• 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, the energy of an earthquake
• Moment magnitude scale, based on the seismic moment
• Surface wave magnitude, based on surface waves

In popular culture:

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