LATIN DICTIONARYLexicon Latīnum
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“fusion” in Latin

The English word fusion itself goes back to Latin fūsus, through fūsiōnem.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

fusion
(of metals)(of metals), coctura: conflatura (a melting): fusura (the melting, casting; e.g., plumbi, Plin., 33, 6, 35): fluxio (the state when the body is in fusion): to be brought into a state of fusion, liquefieri; colliquefieri: to bring into fusion, liquare.

Quick answer

What is the Latin word for fusion?
The usual Latin words for “fusion” are coctūra, cōnflō, fundō; also plumbum, liquefaciō, liquō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.