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fusion (n.)

1550s, "act of melting by heat," from French fusion or directly from Latin fusionem (nominative fusio) "an outpouring, effusion," noun of action from fusus, past participle of fundere "to pour, melt" (from nasalized form of PIE root *gheu- "to pour"). Meaning "union or blending of different things; state of being united or blended" is by 1776; used especially in 19c, of politics, in early 20c. of psychology, atoms, and jazz (in nuclear physics sense, first recorded 1947; in musical sense, by 1972).

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Definitions of fusion from WordNet

fusion (n.)
an occurrence that involves the production of a union;
Synonyms: merger / unification
fusion (n.)
the state of being combined into one body;
Synonyms: coalition
fusion (n.)
the merging of adjacent sounds or syllables or words;
fusion (n.)
a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy;
Synonyms: nuclear fusion / nuclear fusion reaction
fusion (n.)
the combining of images from the two eyes to form a single visual percept;
Synonyms: optical fusion
fusion (n.)
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
fusion (n.)
the act of fusing (or melting) together;
From wordnet.princeton.edu