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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.

See Examples For:

An escalation in European Union trade barriers could pose some risks, as the bloc plans to extend tariff hikes to imports of Chinese plug-in hybrids, they say.

From The Wall Street Journal Jul. 10, 2026

Ian Plummer, chief customer officer of car selling website Autotrader, says the rising EV demand is "driven by intensifying competition and rising consumer interest in plug-in cars".

From BBC Jul. 8, 2026

Fully-electric cars comprised 23% of all cars sold and plug-in hybrid models accounted for 25%.

From The Wall Street Journal Jun. 3, 2026

The Nasdaq-listed company has been struggling with slowing demand for the plug-in hybrid vehicles it specializes in.

From The Wall Street Journal May 28, 2026

I dug up Radar’s e-mail about his Omnictionary program and downloaded the plug-in.

From "Paper Towns" by John Green

It’s coming at a time when electricity demand is rising, in large part because of the artificial-intelligence race and the need to plug in more data centers.

From The Wall Street Journal Jun. 25, 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

Leo doubted the poor guy could pop a spark plug in the shape he was in.

From "The Mark of Athena" by Rick Riordan

China’s exports of EVs more than doubled in March from a year earlier as rising fuel prices boosted the appeal of plug-ins.

From The Wall Street Journal Apr. 12, 2026

In their view, “legal plug-ins will not replace robust, mature tool stacks like Intuit.”

From Barron's Feb. 4, 2026

The company also released plug-ins for finance, customer service and other areas.

From The Wall Street Journal Feb. 3, 2026

A wave of new hybrid models is coming online in 2025, both traditional hybrids and plug-ins.

From Los Angeles Times Jan. 15, 2025

I see that it could be possible to use the logic board from the first one, and the chipsets and plug-ins from the other two.

From "Counting by 7s" by Holly Goldberg Sloan

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