English Reference
noun

fusion

n.
US /ˈfjuʒən/ UK /fjˈuːʒən/ fu·sion UK spelling fusions

  1. 01 B2 Upper Intermediate

    the act of joining two or more things together to make one new thing.

    the process of merging separate elements, ideas, or entities into a single, unified whole.

    Simple

    The new company is a fusion of two smaller tech firms.

    In context

    The architect's latest project represents a perfect fusion of traditional materials and modern, minimalist design principles.

  2. 02 C1 Advanced Technical Science

    a process where small atoms join together to create energy.

    a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.

    Simple

    Scientists are working hard to make energy from fusion a reality.

    In context

    Unlike nuclear fission, which splits atoms, fusion involves forcing nuclei together under immense pressure and temperature to generate power.

    nuclear fusion
  3. 03 B2 Upper Intermediate Cooking

    a style of cooking that mixes ingredients and techniques from different countries.

    a culinary style that intentionally combines elements, ingredients, or techniques from different regional or ethnic traditions.

    Simple

    This restaurant is famous for its Japanese-Mexican fusion dishes.

    In context

    The chef pioneered a unique style of fusion, blending classical French techniques with the bold, spicy flavours of Southeast Asian street food.

  4. 04 B2 Upper Intermediate Music

    a type of music that mixes different styles, like jazz and rock.

    a musical genre that blends different styles, most commonly referring to jazz-rock fusion.

    Simple

    The band plays a cool fusion of jazz and electronic music.

    In context

    During the 1970s, many artists experimented with fusion, incorporating electric instruments and rock rhythms into complex jazz improvisations.

The “joke” in question is that record’s cartoonish send-up of frat-bro culture, set to fusions of hard rock riffs and hip-hop beats.

The Guardian· 21 Aug 2026

And of course, photography has always been about a fusion of ideas and reality.

The Guardian· 25 Aug 2026

First appears c. 1555, in a translation by Richard Eden. From Middle French fusion, from Latin fūsiōnem (the accusative of fūsiō), from fusus, past participle of fundō (“I pour, I melt”) (see also found). Doublet of foison.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin fūsiōnem
Level B2 · Upper Intermediate
Frequency Common
Updated