Definition of nuclear fusion noun from the Oxford Advanced Learner's Dictionary

nuclear fusion

noun

/ˌnjuːkliə ˈfjuːʒn/

/ˌnuːkliər ˈfjuːʒn/

(also fusion)

[uncountable] (physics)

the act or process of combining the nuclei (= central parts) of atoms to form a heavier nucleus, with energy being releasedTopics Physics and chemistryc1

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