Magnitude may refer to:

• Magnitude (mathematics), a measure of the size of a mathematical object

• A logarithmic measure of the brightness of an astronomical object:
  • Apparent magnitude
  • Absolute magnitude
• Magnitude of an eclipse

• Either of two measures of earthquake strength:
  • Richter magnitude scale (including the surface-wave M_s and body wave M_b magnitudes)
  • Moment magnitude scale

Other:

• Magnitude is an attack in the Pokémon fictional world

See also

• Order of magnitude, a coarse measure of numerical size

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