Porteño is a adjective which refers to what is linked to those cities where there is a port . The most common use of the concept is given as demonym to name those born or resident in this type of localities.

For example: “The Buenos Aires singer triumphs in Europe with his new album”, "The Buenos Aires team will travel to Colombia tomorrow to face the last champion of the South American tournament", “The cost of Buenos Aires life rose 7% in the last month according to the measurement of a private consultant”.
The etymological origin of the term that now concerns us is found in Latin. And it is the result of the sum of the word "portus", which is synonymous with "step that allows transport", and the suffix "-eño", which can be translated as "provenance."
The qualifier of Buenos Aires, therefore, varies according to the country . In Argentina , the porteños are the people who were born and / or who live in the Buenos aires city (that is, in the Federal capital ). From this denomination, the subjects of the Province of Buenos Aires, known as Buenos Aires, are left out.
In Chile , the Buenosaireans are the residents of Valparaiso , a city from the central coast. There are also porteños in Costa Rica (who live in Puntarenas ) and Mexico (citizens of Acapulco , Mazatlan and Veracruz ), among other American countries.
The concept of Buenos Aires is also used in Spain . The inhabitants of The Port of Santa Maria , a town of Cádiz , they are usually mentioned as porteños or portuenses.
It should be noted that, beyond the people, the adjective of Buenos Aires applies to organizations, events, products , etc. that have their origin in these cities: “The Buenos Aires act in homage to Mandela summoned three thousand people”, “I don't like Buenos Aires weather, it's too wet”, “Buenos Aires sandwiches are the tastiest in the country”.
However, we cannot ignore the existence of other meanings and uses of the term Buenos Aires. Thus, for example, "El Porteño" was the title of an already extinct magazine in Argentina, which achieved great impact during his career (1982 - 1993) because he addressed issues that, for one reason or another, were "thorny." With that we are referring both to the aboriginal communities of the country and to the disappearance of children or homosexual repression.
Within the sports field, the word that concerns us also has its presence. Specifically, we can say that there is the Porteño Student Athletic Club, of amateur football in Argentina, which was founded in 1902. And that without forgetting that, in the same country, is the Porteño Athletic Club, which belongs to the city from Chacabuco.
Continuing within the football world, we must bear in mind that the term Buenos Aires is also used to refer to two classics that occur in countries such as these:
-In Peru, the Buenos Aires classic is the one that faces, in the city of Callao, Atlético Chalaco and Sporty Boys.
-In Chile, meanwhile, the so-called Buenos Aires classic takes place when Santiago Wanderers de Valparaíso and Everton de Viña del Mar play a match.