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Modem

/mˈoʊdəm/
B1
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(noun) A device that encodes digital computer signals into analog telephone signals and vice versa, allowing computers to communicate over a phone line.

The modem was built into the computer.
Tom has a fast 56k modem.
CEFR Practice Quiz
You may need to restart your ____ if you find that your home internet connection has become very slow or unreliable.

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