I. adjective
EXAMPLES FROM CORPUS
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All it requires is a Palm Pilot type device with a plug-in wireless network card.
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Lifestreams would find your bills, and a plug-in application could crunch the data to produce a pattern.
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Mrs Oram bought the plug-in alarm from a baby shop in Cardiff which has since closed.
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Nowadays, computers are loaded with memory, bulging disk drives and other plug-in devices.
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The essence of these terminals can be changed using a plug-in personality module.
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There's limited expansion potential in the plug-in card area, with just two slots available.
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There was a plug-in kettle, an electric ring for cooking on, and a Gideon's bible, for solace.
II. noun
EXAMPLES FROM CORPUS
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A plug-in is an auxiliary program that works alongside your browser.
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A different search might locate investments in your current portfolio, and another plug-in could rate their performance.
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Overall, this is a really good plug-in and a must-have for movie fans on the Net.
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To understand what a plug-in is, try thinking of your browser as a vacuum cleaner.