What does magnitude mean?

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Definition of magnitude. : the size, extent, or importance of something. : a number that shows the brightness of a star. : a number that shows the power of an earthquake.
1) We did not realize the magnitude of the problem.
2) The auditorium is a building of great magnitude.
3) The effects were substantial in magnitude.
4) They didn't seem to appreciate the magnitude of the problem.
5) 11, I hadn’t realized the magnitude of the problem.
6) You don’t appreciate the magnitude of her achievement.
7) The magnitude of the problem finally soaked into his mind.
8) An earthquake of magnitude 7 is reckoned as a major quake.
9) This data reflects the magnitude of the problem.
10) Stars of the first magnitude are visible to the naked eye.