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Definition of Dimmer
1. Noun. A rheostat that varies the current through an electric light in order to control the level of illumination. 
Definition of Dimmer
1. a device for varying the intensity of illumination [n -S]
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1. Noun. A rheostat that varies the current through an electric light in order to control the level of illumination. 
1. a device for varying the intensity of illumination [n -S]