on-line
1. Pertaining to the operation of a functional unit when under the direct control of the system with which it is associated.
Note 1: On-line units are available for immediate use on demand by the system without human intervention.
Note 2: On-line units may not be independently operated.
2. Pertaining to equipment that is connected to a system, and is in operation.
3. In computer technology, the state or condition of a device or equipment that is under the direct control of another device.
4. In computer technology, the status of a device that is functional and ready for service. Also spelled “on line” and “online. “