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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
plug-in is a noun meaning "a software module that extends or enhances the capabilities of an existing application". It carries 2 recorded senses.
a printed circuit that can be inserted into expansion slots in a computer to increase the computer's capabilities
Definitions, synonyms and semantic relations for plug-in come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.