device
US /dɪˈvaɪs/
UK /dɪˈvaɪs/

1.
a thing made or adapted for a particular purpose, especially a piece of mechanical or electronic equipment
:
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This new device can translate languages in real-time.
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The police found a suspicious device in the abandoned car.
2.
a plan, scheme, or trick, especially one used to achieve a particular purpose
:
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His latest marketing device involved giving away free samples.
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Using humor as a literary device can make a story more engaging.