The Collaborative International Dictionary of English v.0.48:

Municipality \Mu*nic`i*pal"i*ty\, n.; pl. Municipalities. [Cf.
   F. municipalit['e].]
   A municipal district; a borough, city, or incorporated town
   or village.
   [1913 Webster]

WordNet (r) 3.0 (2006):

municipality
    n 1: an urban district having corporate status and powers of
         self-government
    2: people living in a town or city having local self-government

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "municipality":
   Stadt, bailiwick, banlieue, boom town, borough, bourg, bureau,
   burg, burgh, city, commissariat, constablery, constablewick,
   constabulary, conurbation, department, district, exurb, exurbia,
   faubourg, ghost town, greater city, market town, megalopolis,
   metropolis, metropolitan area, ministry, office, outskirts, polis,
   secretariat, sheriffalty, sheriffwick, shrievalty, spread city,
   suburb, suburbia, town, township, urban complex, urban sprawl,
   urbs, village, ville



Bouvier's Law Dictionary, Revised 6th Ed (1856):

MUNICIPALITY. The body of officers, taken collectively, belonging to a city,
who are appointed to manage its affairs and defend its interests.