Definitions:

1. a number assigned to the ratio of two quantities noun
   • two quantities are of the same order of magnitude if one is less than 10 times as large as the other
2. relative importance noun
   • a problem of the first magnitude
3. the property of relative size or extent, whether large or small noun
   • They tried to predict the magnitude of the explosion.

Synonyms:

• order of magnitude
• prominence