a person or thing that couples or links together.
Machinery. a rod or link transmitting force and motion between a rotating part and a rotating or oscillating part.
Also called coupling. Railroads. a device for joining pieces of rolling stock.
a device in an organ or harpsichord for connecting keys, manuals, or a manual and pedals, so that they are played together when one is played.
Electricity. a device for transferring electrical energy from one circuit to another, as a transformer that joins parts of a radio apparatus together by induction.
(in color photography) a chemical that reacts with the developer to produce one of the colors in a print or transparency.

1545–55; couple + -er1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coupler (ˈkʌplə)
1.  a link or rod transmitting power between two rotating mechanisms or a rotating part and a reciprocating part
2.  music a device on an organ or harpsichord connecting two keys, two manuals, etc, so that both may be played at once
3.  electronics a device, such as a transformer, used to couple two or more electrical circuits
4.  (US), (Canadian) Also called (in eg Britain): coupling a device for connecting railway cars or trucks together

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The coupler fractures upon impact at a predetermined scored line in the coupling, releasing the sign post from the ground stub.
Duct tape around hose coupler on sewer line is deteriorating.
Tape is used possible to secure the coupler to sewer line.
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