[fyoo-zhuh n]
See more synonyms for fusion on Thesaurus.com
  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.Compare fission(def 2).
  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.
  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.

Origin of fusion

1545–55: < Latin fūsiōn- (stem of fūsiō) a pouring out, melting. See fuse2, -ion
Related formsfu·sion·al, adjectivenon·fu·sion, noun
Can be confusedfission fusion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for fusion

Contemporary Examples of fusion

Historical Examples of fusion

  • Thus does Arama propound his plan for a fusion between the races.

  • The fusion of the two versifications was as gradual as that of the two vocabularies had been.

  • The fusion is conducted in a Fletcher's crucible furnace in a clay crucible.

    On Laboratory Arts

    Richard Threlfall

  • When fusion is complete, the contents of the crucible are poured into any suitable mould.

    On Laboratory Arts

    Richard Threlfall

  • When the G-4's went out the fusion must have shorted the neutralizers.


    Edward Elmer Smith

British Dictionary definitions for fusion


  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 cuisinefusion cuisine; fusion food

Word Origin for fusion

C16: from Latin fūsiō a pouring out, melting, casting, from fundere to pour out, found ³
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fusion

1550s, from Middle French fusion, from Latin fusionem (nominative fusio) "an outpouring, effusion," noun of action from fusus, past participle of fundere "pour, melt" (see found (v.2)). In nuclear physics sense, first recorded 1947; in jazz sense, by 1972.

Online Etymology Dictionary, © 2010 Douglas Harper

fusion in Medicine


  1. The act or procedure of liquefying or melting by the application of heat.
  2. The merging of different elements into a union, as of vertebrae.
  3. The mechanism by which both eyes blend slightly different images from each eye into a single image.
  4. The growing together of two or more teeth as a result of the abnormal union of their formative organs.
  5. A nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

fusion in Science


  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. See also fission.
  2. A mixture or blend formed by fusing two or more things.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.