What is another word for "dilation"?

Roget's Thesaurus (1911) lists these synonyms for "dilation": ample, amplitude, and, become, bore, breadth, broad, caliber, calibrate, corpulence, crassitude, diameter, discous, dumpy, expand, expansion, extent, fanlike, latifoliate, latitude, outspread, radius, render, rope, size, space, squab, squat, superficial, thick, thicken, thickness, thickset, wide, widen, width.