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(Acoustics) In a mixer:

  1. A line level input designed to receive a signal from an outboard device.
  2. The controls for that input. Any line input can be used as a return or returns can be used for line inputs. Returns don't usually have as extensive of access to auxiliaries and EQ as standard line inputs do.

Source: Church Audio & Acoustics Glossary

(Architecture) Receding edge of a flat face. On a flat signboard, for example, the return is the edge which makes up the board's depth.