The relation or adaptation of one portion to another, or to the whole, as respect magnitude, quantity, or degree; comparative relation; ratio; as, the proportion of the parts of a building, or of the body.(noun)
source: webster1913
verb (v)
give pleasant proportions to(verb.change)
source: wordnet30
adjust in size relative to other things(verb.change)
source: wordnet30
To adjust in a suitable proportion, as one thing or one part to another; as, to proportion the size of a building to its height; to proportion our expenditures to our income.(verb)