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.

Definitions of fusion
  1. noun
    the act of fusing (or melting) together
    see moresee less
    type of:
    combination, combining, compounding
    the act of combining things to form a new whole
  2. noun
    an occurrence that involves the production of a union
    synonyms: merger, unification
    see moresee less
    type of:
    the occurrence of a uniting of separate parts
  3. noun
    the state of being combined into one body
    synonyms: coalition
    see moresee less
    alliance, confederation
    the state of being allied or confederated
    federalisation, federalization
    the state of being under federal control
    type of:
    unification, union
    the state of being joined or united or linked
  4. noun
    the merging of adjacent sounds or syllables or words
    see moresee less
    the fusion of originally different inflected forms (resulting in a reduction in the use of inflections)
    type of:
    linguistic process
    a process involved in human language
  5. noun
    the combining of images from the two eyes to form a single visual percept
    synonyms: optical fusion
    see moresee less
    type of:
    beholding, seeing, visual perception
    perception by means of the eyes
  6. noun
    correction of an unstable part of the spine by joining two or more vertebrae; usually done surgically but sometimes done by traction or immobilization
    synonyms: spinal fusion
    see moresee less
    type of:
    treatment of a specific defect
  7. noun
    a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy
    synonyms: nuclear fusion, nuclear fusion reaction
    see moresee less
    cold fusion
    nuclear fusion at or near room temperatures; claims to have discovered it are generally considered to have been mistaken
    thermonuclear reaction
    a nuclear fusion reaction taking place at very high temperatures (as in the sun)
    carbon cycle
    a thermonuclear reaction in the interior of stars
    type of:
    nuclear reaction
    (physics) a process that alters the energy or structure or composition of atomic nuclei
Word Family

Test prep from the experts

Boost your test score with programs developed by’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.


  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week


  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week


  • Number of words: 700+
  • Duration: 10 weeks
  • Time: 1 hour / week