long-life

The compound adjective 'long-life' is a transparent combination of two native English words, both with deep Germanic roots. 'Long' descends from Proto-Germanic langaz, related to the concept of extended linear space or duration. 'Life' originates from Proto-Germanic libam, meaning "life, body." The compound's logic is entirely literal, directly combining the sense of extended duration ('long') with the period of existence or functionality ('life'). This straightforward semantic construction first emerged in the 19th and 20th centuries, primarily in commercial and technical contexts, to describe products—especially batteries, light bulbs, and processed foods—engineered for durability or an extended period of use before failure or spoilage, thus metaphorically granting them a "long life."

Structure: long (extended in duration) + life (existence) - long: From Old English lang, long, meaning "having considerable linear extent, lasting a considerable time." Its functional role is as an adjective modifying the noun. - life: From Old English līf, meaning "existence, lifetime, way of life." Its functional role is as the head noun being modified.