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Definition of photon noun from the Oxford Advanced Learner's Dictionary

photon

noun

/ˈfəʊtɒn/

/ˈfəʊtɑːn/

(physics)

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a unit of electromagnetic energyTopics Physics and chemistryc2
Word Originearly 20th cent.: from Greek phōs, phōt- ‘light’, on the pattern of electron.

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noun

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C1

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