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Magnitude (n.) Extent of dimensions; size; -- applied to things that have length, breath, and thickness.
Magnitude (n.) That which has one or more of the three dimensions, length, breadth, and thickness.
Magnitude (n.) Anything of which greater or less can be predicated, as time, weight, force, and the like.
Magnitude (n.) Greatness; grandeur.
Magnitude (n.) Greatness, in reference to influence or effect; importance; as, an affair of magnitude.