What is another word for "extension"?

Roget's Thesaurus (1911) lists these synonyms for "extension": accession, accretion, add, additional, administration, administrative, advance, aedile, aggrandize, aggrandizement, aggravate, aggravation, ahead, alguazil, arm, ascend, ascent, augment, augmentation, authority, bailiff, bailiwick, beadle, bearer, bedel, bureau, catchpoll, causidical, commission, constable, constabulary, cop, coroner, corporation, crescendo, customhouse, deepen, department, development, dilatation.