Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “plug-in”


noun [C]    /ˈplʌɡ ˌɪn/
a small device or computer program that is designed to be used with and fits into a larger one
(Definition of plug-in noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of plug-in

Definitions of “plug-in” in other dictionaries

Translations of “plug-in”

Word of the Day


relating to behaviour between people that is pleasant and friendly, often despite a difficult situation

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More