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- IPA: /mægnɪtjuːd/
- The exact or approximate size, extent or importance of something.
- (mathematics) A number that is assigned to something so that it may be compared to others numerically; it is always a positive number (more than zero).
- (astronomy) The apparent brightness of a star.
- (geology) A measure of the energy of an earthquake (for example, on the Richter scale).