lunion

Lunion is the French term for "the union" and is used in a range of contexts to denote a joining, alliance, or federation. Etymology traces it to the Latin unio, unonis, through Old French union, sharing roots with the English word union. In everyday language, l'union can refer to any act of joining, a social or legal bond, or a political alliance. It is used in phrases such as l'union européenne (the European Union), l'union matrimoniale (marriage), and l'union civile (civil union). In mathematics and logic, l'union designates the operation that combines the elements of two or more sets into a single set, commonly written as A ∪ B for the union of A and B.

As a proper noun, L'Union is the name of several French-language newspapers and organizations, reflecting its use as a distinctive name in regional media and public life. The form l'union is also encountered in historical and contemporary discourse when referring to coalitions, federations, or other forms of collective association.

In summary, l'union functions as a versatile term in French, bridging everyday language, legal and political phrases, mathematical notation, and occasional proper-name usage in media and institutions.