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a time interval between the stimulation and response

Latency is a time interval between the stimulation and response.

the time the time takes for a packet to travel between two locations

Latency is the time the time takes for a packet to travel between two locations.

the measure of delay on the network

Latency is the measure of delay on the network, usually measured in milliseconds and for round trip time.

the delay a network packet takes to reach a network packet's destination

Roughly, latency is the delay a network packet takes to reach a network packet's destination.