Origin: 1250–1300; (n.) ME
syse orig., control, regulation, limit < OF
sise, aph. var. of
assise assize; (v.) in part repr. late ME
sisen to regulate (itself partly deriv. of the n., partly aph. var. of
assisen to fix, ordain, assess < OF
assiser, deriv. of
assise assize ), in part deriv. of the n. in later senses
Synonyms:
1. Size, volume, mass, bulk are terms referring to the extent or dimensions of that which has magnitude and occupies space. Size is the general word: of great size; small in size. Volume often applies to something that has no fixed shape: Smoke has volume. Mass, also, does not suggest shape, but suggests a quantity of matter in a solid body: a mass of concrete. Bulk suggests weight, and often a recognizable, though perhaps unwieldy, shape: the huge bulk of an elephant.
[sahyz] 
noun, verb, sized, siz⋅ing.