fusion

American  

[fyoo-zhuhn] / ˈfyu ʒən /

noun

1. the act or process of fusing; the state of being fused.

2. that which is fused; the result of fusing.

   A ballet production is the fusion of many talents.

3. Politics.

   1. a coalition of parties or factions.

   2. (initial capital letter) the political party resulting from such a coalition.

4. Also called nuclear fusion.  Physics. a thermonuclear reaction in which nuclei of light atoms join to form nuclei of heavier atoms, as the combination of deuterium atoms to form helium atoms.

5. Ophthalmology

   1. Also called binocular fusion.  the correct blending of the images of both eyes.

   2. the perception of rapid, intermittent flashes of light as a continuous beam.

6. popular music that is a blend of two styles, especially a combining of jazz with either rock, classical music, or such ethnic elements as Brazilian or Japanese music.

7. Linguistics. the merging of linguistic elements, especially morphemes, usually accompanied by a change in the form of the elements.

---

adjective

1. (of food or cooking) combining usually widely differing ethnic or regional ingredients, styles, or techniques.

   a restaurant serving French-Thai fusion cuisine; a fusion menu.

fusion British  

/ ˈfjuːʒən /

noun

1. the act or process of fusing or melting together; union

2. the state of being fused

3. something produced by fusing

4. See nuclear fusion

5. the merging of juxtaposed speech sounds, morphemes, or words

6. a coalition of political parties or other groups, esp to support common candidates at an election

7. a kind of popular music that is a blend of two or more styles, such as jazz and funk

8. psychol the processing by the mind of elements falling on the two eyes so that they yield a single percept

9. (modifier) relating to a style of cooking which combines traditional Western techniques and ingredients with those used in Eastern cuisine

   fusion cuisine

   fusion food

---

fusion Scientific  

/ fyo̅o̅′zhən /

1. The joining together of atomic nuclei, especially hydrogen or other light nuclei, to form a heavier nucleus, especially a helium nucleus. Fusion occurs when plasmas are heated to extremely high temperatures, forcing the nuclei to collide at great speed. The resulting unstable nucleus emits one or more neutrons at very high speeds, releasing more energy than was required to fuse the nuclei, thereby making chain-reactions possible, since the reaction is exothermic. Fusion reactions are the source of the energy in the Sun and in other stars, and in hydrogen bombs.

2. See also fission

3. A mixture or blend formed by fusing two or more things.

---

Other Word Forms

• fusional
  adjective
• nonfusion
  noun

Etymology

Origin of fusion

First recorded in 1545–55; from Latin fūsiōn- (stem of fūsiō ) “a pouring out, melting”; see fuse ², -ion; fusion def. 4 was first recorded in 1945–50

Explanation

Fusion is the process of combining two or more things together into one. If your favorite genres are Westerns and reality dating shows, maybe when you become a TV executive, you'll create a fusion of the two, where competing dates have shoot-outs in saloons. The noun fusion comes from the Latin word fundere, meaning melt, so fusion is the act of melting things together. In science, fusion is the process of merging atoms together to create energy. Fusion is also used as an adjective. Fusion cuisine is the combination of at least two different ways of cooking. Fusion music is usually the combination of jazz and rock.

Example Sentences

Other cheaper, smaller fusion tubes are used to monitor conditions elsewhere.

From BBC • May 13, 2026

Clarke: One of the cool things about the fusion music that we came up with, and even Stewart, the music that you were doing with the Police and beyond, was always very progressive-sounding to me.

From Los Angeles Times • May 4, 2026

Kevin McGurn helped drive the company’s unexpected foray into fusion energy.

From The Wall Street Journal • May 4, 2026

Kevin McGurn became interim CEO of Trump Media & Technology Group, tasked with figuring out how to integrate or separate its social media, cryptocurrency, and nuclear fusion ventures.

From The Wall Street Journal • May 1, 2026

From Mayes with the linebackers, filling up an entire blackboard with defenses and read responsibilities that looked like an equation for nuclear fusion.

From "Friday Night Lights: A Town, A Team, And A Dream" by H.G. Bissinger

Related Words

• amalgam
• blend
• blending
• synthesis