means a device that produces light, especially one powered by oil, gas, or electricity and used to illuminate a room or space.

from From the Greek 'lampas,' meaning torch or light, built on the verb 'lampein,' to shine. It traveled through Latin 'lampada' and Old French 'lampe' before settling into English, so the word has glowed in roughly the same shape for a very long time — every lamp is, etymologically, a little kept flame.