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  • plug-in
    plug-in
    adjective
    capable of or designed for being connected to an electrical power source by plugging in or inserting: a plug-in transistor.
  • plug in
    plug in
    verb
    (tr, adverb) to connect (an electrical appliance) with a power source by means of an electrical plug
Synonyms

plug-in

American  
[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 transistor.

    a plug-in hair dryer;

    a plug-in transistor.


noun

plug-ins plural
  1. plug.

  2. jack.

  3. a plug-in appliance.

  4. Computers. a small software program that builds additional functionality into a stand-alone computer application.

    Your web browser can’t display this video without a plug-in.

plug in British  

verb

  1. (tr, adverb) to connect (an electrical appliance) with a power source by means of an electrical plug

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. a device that can be connected by means of a plug

  2. computing a module or piece of software that can be added to a system to provide extra functions or features, esp software that enhances the capabilities of a web browser

  3. computing ( as modifier )

    plug-in memory cards

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
plug-in Scientific  
/ plŭgĭn′ /
  1. 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.


Other Word Forms

Noun Inflected Forms

Etymology

Origin of plug-in

First recorded in 1920–25; adjective and noun use of verb phrase plug in

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

When they get home, the residents of a small housing association on the outskirts of Hudiksvall, Sweden, plug in their electric vehicles to charge them or, intriguingly, power their homes.

From Barron's • Jun. 12, 2026

Although the vehicles may be capable of driving themselves, they can’t clean their own interiors, plug in a charging cable or repair hardware.

From MarketWatch • Apr. 30, 2026

To game that out, Klosterman said you could invent and plug in a weather forecast with higher temperatures.

From Los Angeles Times • Mar. 26, 2026

Miliband's focus today is on plug in solar panels, which he says will be available to buy in the UK later this year.

From BBC • Mar. 23, 2026

While the other girls press Lara for more clues, I lie back on my pillow, pull out my cell phone, and plug in my earbuds.

From "Amari and the Night Brothers" by B.B. Alston

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