device
noun
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any clever maneuver“They would stoop to any device to win a point.”gimmicktwist
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an instrumentality invented for a particular purpose“the device is small enough to wear on your wrist”
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an emblematic design, especially in heraldry“The family's shield was easily recognisable by its devices.”
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any ornamental pattern or design (as in embroidery)
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something in an artistic work designed to achieve a particular effect