Chaîne

Chaîne is a French noun with various senses rooted in the idea of linked elements. At its core, a chaîne is a sequence of connected links, but the term is used broadly to denote any line, series, or network of related parts. The word derives from the Latin catena and entered Old French as chaine, later acquiring the modern spelling.

In everyday usage, chaîne can refer to a physical chain of metal or other materials. It also designates extended linear formations in geography, such as a chaîne de montagnes (mountain range). In ecology and economics, it forms common compounds: chaîne alimentaire (food chain) describes energy transfer among organisms; chaîne d'approvisionnement (supply chain) covers the network that moves goods from production to consumer; chaîne de production (production line).

In science and mathematics, the term appears in more abstract forms: chaîne de Markov (Markov chain) models sequential processes; chaîne de caractères, or string, is a sequence of characters in computing; sometimes chaîne denotes a polymer chain in chemistry and materials science.

In media and broadcasting, chaîne is used for channels, especially télévision or radio channels, with phrases like chaîne de télévision or chaîne radiophonique.

The word is widely productive in French, linking physical objects, geographical formations, processes, and information structures. In English, chain is the corresponding term, while French usage adapts the sense to many domains by attaching appropriate modifiers and compounds.