Definitions from Wiktionary (light bulb)

▸ noun:  An evacuated glass bulb containing a metal filament which is heated by electrical resistance to produce light.
▸ noun:  (by extension) An article that resembles such a bulb and converts electricity to light by any process.
▸ noun:  (figuratively) Used in reference to the sudden arrival of a realization, an inspiration, an idea, or the like.
▸ Also see light_bulb

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