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In the context of audio-visual systems, "latency" specifically refers to the delay that occurs between the moment a signal is inputted into the system and the moment it is outputted as sound or video. This delay can affect the overall performance and user experience of various AV setups, especially in scenarios like live events or presentations where synchronization between audio and video is crucial.

Understanding this concept is essential for technicians and AV specialists, as high latency can lead to noticeable discrepancies that impair communication and enjoyment. While options that mention specific aspects of latency, such as the time taken for video signals to reach the display or audio synchronization delays, are related, they don't encompass the broader definition of latency which covers any type of signal delay in the system. Hence, identifying the comprehensive definition that captures the entire scope of latency in AV contexts clarifies its significance.