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1. Size; extent; dimensions: to determine the magnitude of an angle. 2. Great importance or consequence: affairs of magnitude. 3. Greatness of size or amount. 4. Moral greatness: magnitude of mind. 5. Astronomy. In mathematics: - Magnitude (mathematics), the relative size of a mathematical object. - Magnitude (vector), 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 apparent brightness of a celestial object as observed from Earth. - 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 mpg - 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,a measure of the energy of an earthquake. - Moment magnitude scale, an alternative to the Richter scale for measuring earthquakes.
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