unión

Unión is the Spanish term for “union” and is used in a variety of linguistic, political, mathematical, and geographical contexts. In the Spanish language the word denotes the act of joining or combining elements into a single entity, and it appears in expressions such as “unión civil” (civil union) and “unión laboral” (labor union).

In politics and labor relations, a unión refers to an organized association of workers that negotiates collective bargaining agreements, defends members’ rights, and coordinates industrial action. Spanish‑language unions are often affiliated with larger federations, such as the Confederación Sindical Internacional (CSI) or national umbrella organizations like the Confederación General del Trabajo (CGT) in Spain and the Confederación de Trabajadores de México (CTM) in Mexico.

In mathematics, la unión designates the set‑theoretic operation that combines all elements of two or more sets into a single set, denoted by the symbol ∪. The concept is fundamental in fields ranging from algebra to topology and computer science.

Geographically, Unión is a common toponym in Spanish‑speaking countries. Notable examples include Unión, a municipality in the province of Buenos Aires, Argentina; Unión, a district in the Lima Region of Peru; and La Unión, a town in the autonomous community of Extremadura, Spain. Many of these localities acquired the name during periods of administrative consolidation or as a reference to the unity of surrounding communities.

In sport, several clubs carry the name Unión, such as Club Atlético Unión in Argentina and Unión Huaral in Peru, reflecting the term’s connotation of collective identity and teamwork.