AskDefine | Define photon

Dictionary Definition

photon n : a quantum of electromagnetic radiation; an elementary particle that is its own antiparticle

User Contributed Dictionary



From photo- + -on.




  1. The quantum of light and other electromagnetic energy, regarded as a discrete particle having zero rest mass, no electric charge, and an indefinitely long lifetime. It is a gauge boson.

Derived terms


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Synonyms, Antonyms and Related Words

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