magnitude

noun

1. (countable, uncountable)The absolute or relative size, extent or importance of something.

   “And on a programme of works of this magnitude, passengers will need to be mindful of the age-old maxim of 'no gain without pain'.”

2. (countable)An order of magnitude.
3. (countable, uncountable)A number, assigned to something, such that it may be compared to others numerically
4. (countable, uncountable)Of a vector, the norm, most commonly, the two-norm.
5. (uncountable)A logarithmic scale of brightness defined so that a difference of 5 magnitudes is a factor of 100.
6. (countable)A logarithmic scale of brightness defined so that a difference of 5 magnitudes is a factor of 100.

   “Observations in the infrared domain allow one to penetrate the ~25-30 magnitudes of extinction present at visible wavelengths.”

7. (countable, uncountable)A measure of the energy released by an earthquake (e.g. on the Richter scale).