The term relates to a specific point in time, typically when a device, system, or infrastructure component is actively operational and fulfilling its intended purpose. It signifies that the entity is not merely built or installed, but is actively contributing to the overall functioning of the larger system. An example would be a newly commissioned power plant that begins supplying electricity to the grid.
Understanding this operational commencement is critical for tracking investments, performance metrics, and lifecycle management. Knowing precisely when something becomes functional allows for accurate depreciation calculations, performance monitoring against design specifications, and efficient resource allocation for maintenance and upgrades. The historical context often involves formal acceptance testing and handover procedures to ensure the item meets all required standards before this operational start date.