noun
An object in a lamp that gives light when electricity passes through it.
I need to change the lightbulb in the kitchen.
Common phrases & grammar
change a lightbulb · replace a lightbulb
American English
How to pronounce lightbulb
nounB1
LAITbuhlb
/ˈlaɪt̚ˌbəlb̚/
2 syllables · Stress the first syllable.
An object in a lamp that gives light when electricity passes through it.
Practice out loudMeanings & examples
nouninformalless common
A sudden idea or moment when you understand something.
I had a lightbulb moment and found the answer.
Common phrases & grammar
lightbulb moment · have a lightbulb moment
Related words & forms
It is also commonly written as two words: light bulb.