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Definitions:
Noun
uplink
Definition: a transmission from Earth to a spacecraft or the path of such a transmission
Definition: 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.
Verb
Definition: To transmit a signal by means of an uplink.