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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:

New-energy vehicles, including plug-in hybrids and battery EVs, accounted for more than half of Geely’s total deliveries in the first half.

From The Wall Street Journal Aug. 17, 2026

Sales of fully-electric and plug-in hybrid models grew 15% and accounted for 53% of all Volvo cars sold globally, it added.

From The Wall Street Journal Aug. 4, 2026

Fully electric and plug-in hybrid sales accounted for less than 8% of all car sales in June, down from a peak of just over 12% right before the tax break was killed off.

From MarketWatch Aug. 4, 2026

It said that 52 percent of its passenger car sales in Europe are now electrified vehicles -- fully electric, plug-in hybrids and non-plug-in hybrids -- up from 43.8 percent in the first half of 2025.

From Barron's Jul. 23, 2026

I drop to my knees and rummage through, finally landing upon my beloved/hated Nokia plug-in.

From "Better Nate Than Ever" by Tim Federle

With digital cameras offering an element of surprise when you plug in the memory card reader to your computer at home, digital cameras capture a moment in time.

From BBC Aug. 8, 2026

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

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

“I just plug in the same way I always have. I have spent zero seconds modifying my behavior as a result of this war.”

From MarketWatch May 2, 2026

Upstairs, I plug in my phone and lie down on the bed.

From "The Girl on the Train" by Paula Hawkins

Customers can create private plug-ins from scratch or customize plug-ins based on Claude’s starter templates, which include options for human resources, equity research, engineering, wealth management, and other functions.

From Barron's Feb. 23, 2026

The Cowork plug-ins were like a match on dry tinder.

From The Wall Street Journal Feb. 5, 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

“With plug-ins, like for guitar or piano. Or you can use a sampler.”

From "Amina's Song" by Hena Khan

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