Definitions

nuclear fusion

[noo-klee-er fyoo-zhuhn, nyoo-] / ˈnu kli ər ˈfyu ʒən, ˈnyu- /

NOUN

atomic fusion

Synonyms

WEAK

cold fusion fusion fusion reaction laser-induced fusion thermonuclear fusion thermonuclear reaction

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Actual power from nuclear fusion “has seemingly always been 10 to 20 years away,” Levin said.

From MarketWatch • May 18, 2026

Being accused of attempting the impossible is not unusual for the scientists and engineers working on nuclear fusion projects around the world.

From BBC • Apr. 20, 2026

In 25 years, Mike Bechtel thinks we will have a new source of clean, abundant energy: nuclear fusion.

From The Wall Street Journal • Apr. 6, 2026

The instrument is TAE Technologies, a Foothill Ranch-based company working to develop the technology of nuclear fusion as a clean energy source.

From Los Angeles Times • Mar. 3, 2026

Like nuclear fusion, it’s not easy to explain but it had an enormous effect.

From "The Story of Music" by Howard Goodall