Plug-in

//ˈplʌɡ.ɪn// adj, noun

adj, noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    Anything that plugs into something.
  2. 2
    a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities wordnet
  3. 3
    A module or device that interacts with another to add a specific feature or function.
  4. 4
    a software module that extends or enhances the capabilities of an existing application wordnet
  5. 5
    An electric vehicle that can be recharged from an external power source.
Show 1 more definition
  1. 6
    An air freshener that can be charged by connecting it to the mains power supply.

    "They take your best bottle of Châteauneuf-du-Pape and boil it up with Satsuma peel and bits of stick, resulting in a hot sour wine and every room of the house smelling like a festive Airwick Plug-in has exploded, with the added bonus that all your best pans are now ruined. Cheers!"

Adjective
  1. 1
    Designed to be plugged into an electrical power outlet or circuit. not-comparable
  2. 2
    Able to be extended with further components in a modular fashion. not-comparable

Synonyms

All synonyms
add-inadd-onboardcardcircuit boardcircuit card

Example

More examples

"The only plug-in that crashes on my browser is Flash."

Etymology

Deverbal from plug in.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.