Englishfor English speakers
automatic
Adjective
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If something is automatic, it works by itself.
A washing machine is automatic.
automatic
Noun
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A car that changes the gear by itself is called an automatic.
The car is not manual shift, it is automatic.
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A gun that continues to fire while the trigger is pressed is called an automatic.
That machine gun is an automatic.
boiler
Noun
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A boiler is a large container where water is heated, usually for the purpose of heating a building.
The water from the boiler heats the whole building.