- In science, magnitude refers to the numerical size of something: see orders of magnitude.
- In mathematics, the magnitude of an object is a non-negative real number, which in simple terms is its length.
- In astronomy, magnitude refers to the logarithmic measure of the brightness of an object, measured in a specific wavelength or passband, usually in optical or near-infrared wavelengths: see apparent magnitude and absolute magnitude.
- In geology, the magnitude is a logarithmic measure of the energy released during an earthquake. See Richter scale.
This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.