Definition of Upink

The portion of a communications link used for the transmission of signals from an Earth terminal to a satellite or to an airborne platform. An uplink is the converse of a downlink. An uplink or downlink is distinguished from reverse link or forward link.
By analogy and less formally, the communication path from a mobile device to a base station, a consumer to the network backbone, a client device to a server etc.
Pertaining to data transmission from a data station to the headend.
Pertaining to GSM and cellular networks, uplink is the transmission path from a mobile station to the base station (cell site).

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