(1):

(n.) Greatness, in reference to influence or effect; importance; as, an affair of magnitude.

(2):

(n.) Greatness; grandeur.

(3):

(n.) That which has one or more of the three dimensions, length, breadth, and thickness.

(4):

(n.) Extent of dimensions; size; - applied to things that have length, breath, and thickness.

(5):

(n.) Anything of which greater or less can be predicated, as time, weight, force, and the like.