Which term best fits the definition of renovate, improve, or reconstruct?

The term "overhaul" best fits the definition of renovate, improve, or reconstruct because it involves a comprehensive examination and significant modification of a system, device, or structure. Overhauling typically encompasses extensive upgrades or replacements of parts, often with the goal of enhancing performance, extending lifespan, and ensuring the system operates at optimal efficiency.

This term implies a thorough process that goes beyond simple fixes, suggesting a complete transformation or significant enhancement. It signifies not just making things look better, but a deeper, more thorough approach to improving functionality, which aligns well with the concepts of renovation and reconstruction.

In contrast, while refurbish refers to the process of cleaning up and making something look new again, it does not necessarily imply structural change or deep improvement. Maintain suggests the ongoing act of keeping something in its current condition, and repair tends to refer to fixing specific issues rather than a holistic approach to improvement.