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

axion

noun

/ˈæksiən/

/ˈæksiən/

(physics)

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according to some theories, a particle smaller than an atom that is very light and has no electrical charge
Word Origin1970s: from axial + -on.

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See axion in the Oxford Advanced American Dictionary

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noun

From the Word list

B2

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