English to English
1. the property of relative size or extent (whether large or small)
they tried to predict the magnitude of the explosion|about the magnitude of a small pea
2. a number assigned to the ratio of two quantities; two quantities are of the same order of magnitude if one is less than 10 times as large as the other; the number of magnitudes that the quantities differ is specified to within a power of 10
3. relative importance
a problem of the first magnitude
4. Extent of dimensions; size; -- applied to things that have length, breadth, and thickness.