(physics) A nuclear reaction in which nuclei combine to form more massive nuclei with the concomitant release of energy.

(nonstandard) to combine; to fuse

plural of fusion

The political practice, principle or theory of forming groups. / A political philosophy advocating fusion of traditionalist social conservatism with right-libertarianism.

plural of fusioneer

(music) A performer or composer of fusion music / An adherent of controlled nuclear fusion as a useable source of energy.

(linguistics, of a language) Tending to overlay many morphemes in a manner that can be difficult to segment.

A hypothetical form of nuclear fusion not requiring the usual immensely high temperatures.

(physics) The combining of the nuclei of small atoms to form the nuclei of larger ones, with a resulting release of large quantities of energy; the process that makes the sun shine, and hydrogen bomb explode.

(physics) nuclear fusion involving helium nuclei.