What is another word for "dilatation"?

Roget's Thesaurus (1911) lists these synonyms for "dilatation": absence, accession, accretion, add, additional, advance, aggrandize, aggrandizement, aggravate, aggravation, ahead, ascend, ascent, augment, augmentation, cavernous, compressibility, compressible, crescendo, deepen, development, diffusion, dilate, disperse, dispersion, enhance, enlarge, enlargement, ether, evaporation, exacerbate, exacerbation, exaggerate, exaggeration, exalt, exasperate, expand, expansion, extension, fine.