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Short for Reverberation. The dense collection of echoes which bounce off acoustically reflective surfaces in response to direct sound arriving from a signal source. Reverberation can also be created artificially using various analogue or, more commonly, digital techniques. Reverberation occurs a short while after the source signal because of the finite time taken for the sound to reach a reflective surface and return - the overall delay being representative of the size of the acoustic environment. The reverberation signal can be broadly defined as having two main components, a group of distinct ‘early reflections’ followed by a noise-like tail of dense reflections.

The time delay experienced between a sound or control signal being generated and it being auditioned or taking effect, measured in seconds.  (cf. Delay) Each 1ms of latency = approximately being 1 foot away from your speakers, which means with headphones/IEMs (In-ear Monitors) you might get away with slightly higher audio interface latency than with speakers/wedges. If your computer can handle it, switching to higher sample rates like 96kHz when recording can reduce latency.