junction box

noun Electricity.
an enclosure that houses electric wires or cables that are joined together and protects the connections.

Origin:
1895–1900

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
junction box
 
n
an earthed enclosure within which wires or cables can be safely connected

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
junction box   (jŭngk'shən)  Pronunciation Key 
An enclosure within which electric circuits, such as the electrical wiring for different sections of a building, are connected to other circuits, such as outside power sources. Junction boxes are very common in telecommunications circuitry and are used to protect the connections and provide easy access to them.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
When the power goes out, so does your phone after the battery pack in your home
  junction box goes dead in a few hours.
The rest of the system has a garden station, which is a junction box for all
  the sensors and a place to secure the wiring.
It involved a large electrical junction box, or vault, which was suspended from
  the ceiling.
Using a hammer and screwdriver, tap on the center hole of the junction box and
  remove.
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