reused

Reused is the past participle of reuse and describes items or systems that have been used previously and are used again. The term is used across disciplines to denote extending the life of goods, materials, information, or energy through subsequent use, refurbishment, or repurposing rather than disposal.

In material contexts, reused items include packaging, containers, pallets, textiles, furniture, and building materials. Reuse reduces resource extraction, minimizes waste, and can lower lifecycle environmental impact if done safely and efficiently. Common practices include donation, resale, refurbishment, and repair. In utilities, water reuse (reclaimed wastewater, greywater) and energy recovery from waste heat or biogas are examples.

In information technology and software, reuse refers to using existing code, libraries, or data components in new systems to save development time and improve reliability. Data reuse involves reanalyzing or validating data for multiple studies or applications, often under governance and provenance constraints.

Benefits include resource conservation, cost savings, and reduced environmental footprint. Challenges encompass quality variation, compatibility, regulatory or safety requirements, and the need for standards and documentation to ensure trust in reused items.

Reused concepts are central to the circular economy, salvage economies, and sustainable design, reflecting shifting priorities from single-use to ongoing utility.