transformer

US /trænsˈfɔːr.mɚ/
UK /trænsˈfɔːr.mɚ/
"transformer" picture
1.

an apparatus for reducing or increasing the voltage of an alternating current

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The power grid uses large transformers to adjust voltage levels.
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A small transformer is needed to charge this device.
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converterregulator
2.

a person or thing that transforms something

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The new coach was a true transformer for the team, leading them to victory.
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This software acts as a data transformer, converting formats.
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changerconvertermodifier
1.

a fictional robot capable of transforming into a vehicle or other object

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My favorite childhood toy was an Optimus Prime Transformer.
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The movie features giant Transformers battling on Earth.
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transformationtransform