The meaning of MAGNITUDE is great size or extent. How to use magnitude in a sentence.

[uncountable] (formal) the great size or importance of something; the degree to which something is large or important. We did not realize the magnitude of the problem. They appear to underestimate the …

A star’s brightness measured as either absolute magnitude or apparent magnitude. The latter states brightness in the sky on a scale from -26.8 (the Sun, brightest) to +25 (the faintest).

Magnitude is also a measure of the brightness of a star as it appears from earth.

Magnitude is used in stating the size or extent of something such as a star, earthquake, or explosion.

In mathematics, the magnitude or size of a mathematical object is a property which determines whether the object is larger or smaller than other objects of the same kind.

Mar 11, 2026 · Noun magnitude (countable and uncountable, plural magnitudes) (uncountable, countable) The absolute or relative size, extent or importance of something.