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plug-in

[pluhg-in] /ˈplʌgˌɪn/
adjective
1.
capable of or designed for being connected to an electrical power source by plugging in or inserting:
a plug-in hair dryer; a plug-in transistor.
noun
2.
plug (def 3).
3.
jack1 (def 3).
4.
a plug-in appliance.
Origin
1920-1925
1920-25; adj., noun use of verb phrase plug in
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for plugin

plug-in

adj.

1922, from plug (v.) + in (adv.).

Online Etymology Dictionary, © 2010 Douglas Harper
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plugin in Science
plug-in
  (plŭg'ĭn')   
An accessory software or hardware package that is used in conjunction with an existing application or device to extend its capabilities or provide additional functions.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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