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In terms of network latency this can be defined by the time it takes for a request to travel from the sender to the receiver and for the receiver to process that request. In other words, the round trip time from the browser to the server.
In the context of computer networks, jitter is the variation in latency as measured in the variability over time of the packet latency across a network. A network with constant latency has no variation (or jitter). Packet jitter is expressed as an average of the deviation from the network mean latency. However, for this use, the term is imprecise.