Wikipedia
A municipiu (from Latin municipium; English: municipality) is a level of administrative subdivision in Romania, roughly equivalent to city in some English-speaking countries. This status is given to towns that are quite large and urbanized; at present, there are 103 municipii. There is no clear benchmark regarding the status of municipiu even though it applies to localities which have a sizeable population, usually above 15,000, and extensive urban infrastructure. Localities that do not meet these loose guidelines are classified only as towns ( orașe), or if they are not urban areas, as communes (comune). Cities are governed by a mayor and local council. There are no official administrative subdivisions of cities even though, unofficially, municipalities may be divided into quarters/districts (cartiere in Romanian). The exception to this is Bucharest, which has a status similar to that of a county, and is officially subdivided into six administrative sectors.
The term is also used in Moldova, where it applies to five places: Bălți, Chișinău, Comrat, Bender and Tiraspol.