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

Definition of magnitude noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

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.

In math, magnitude compares numbers by powers of 10. If your weekly allowance was $10, but your brother's was $100, his allowance would be one order of magnitude higher than yours.

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

Jan 20, 2026 · Noun magnitude (countable and uncountable, plural magnitudes) (uncountable, countable) The absolute or relative size, extent or importance of something.

There are nine meanings listed in OED's entry for the noun magnitude, one of which is labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Illustrated definition of Magnitude: The size of something. The magnitude of a number (also called its absolute value) is its distance from...

Values are measured by eye (visual magnitude) or more accurately by photometric or photographic methods, and range from –26.7 (the sun), through 1.5 (Sirius), down to about +30.