Definition of "Fusion" :

noun: the act of fusing (or melting) together

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

noun: the combining of images from the two eyes to form a single visual percept

noun: an occurrence that involves the production of a union

noun: a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy

noun: the merging of adjacent sounds or syllables or words

noun: the state of being combined into one body