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cou·pler / ˈkəp(ə)lər/ • n. something that connects two things, esp. mechanical components or systems: a hydraulic coupler. ∎  Mus. a device in an organ for connecting two manuals so that they both sound when only one is played. ∎  Mus. (also octave coupler) a similar device for connecting notes with their octaves above or below. ∎  Photog. a compound in a developer or an emulsion that combines with the products of development to form an insoluble dye, part of the image. ∎  (also acoustic coupler) a modem that converts digital signals from a computer into audible sound signals and vice versa, so that the former can be transmitted and received over telephone lines.