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Definition of Dimmer switch
1. Noun. A light switch which can adjust the brightness of the switched lamp from dim to bright, as well as turning it on and off. ¹
2. Noun. (rare) A switch that changes the headlamps on a motor vehicle from low to high and from high to low beam; a high-beam switch; a brights switch. ¹
¹ Source: wiktionary.com