Bairro

A bairro () is a Portuguese word for a quarter or a neighborhood or, sometimes, a district which is within a city or town. It is commonly used in Brazil, Mozambique, Guinea-Bissau, Portugal, and other Portuguese-speaking places. "Bairro" is cognate with Germanic "berg", "burg", "borg", "burgh", "borough" etc., and Spanish "barrio", all of which descend from the same Proto-Indo European root.
In Brazil, the word is frequently applied to urban areas in cities, in which the "bairros" are generally defined only unofficially and have rough borders, without any official administrative function. In some cities, however, the "bairros" have defined territorial limits set by the municipal government, but most follow popular definition by its citizens.
In Portugal, the word is used with the same meaning as in Brazil, defining a non administrative urban area, frequently without clear borders, an example being the Bairro Alto in Lisbon. Occasionally, a Portuguese "bairro" can coincide with an administrative "freguesia" (civil parish). In the past, the cities of Lisbon and Porto were divided in large administrative divisions - each encompassing several "freguesias" - which were also named "bairros". 
In Mozambique, "bairros" are administrative subdivisions of urban districts with important functions in the identification of the residents and determine the attributes of the area in regard to construction or agriculture, much like zoning. They are directed by "secretários".
In Guinea-Bissau, "bairros" are first the peri-urban quarters of the capital Bissau beyond the old city centre (Praça), e.g. Bairro de Ajuda, Bairro Militar, Pessak, Quelele, Luanda, Mpantcha, and by extension quarters of smaller towns throughout the country.