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1. In communications, the coded representation of the source or destination of a message. (188) 2. In data processing, a character or group of characters that identifies a register, a particular part of storage, or some other data source or destination. (188) 3. To assign to a device or item of data a label to identify its location. (188) 4. The part of a selection signal that indicates the destination of a call. 5. To refer to a device or data item by its address.