fusion

(noun) an occurrence that involves the production of a union. Synonyms: merger, unification.

(noun) the state of being combined into one body. Synonyms: coalition.

(noun) the merging of adjacent sounds or syllables or words.

(noun) a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy. Synonyms: nuclear fusion, nuclear fusion reaction.

(noun) the combining of images from the two eyes to form a single visual percept. Synonyms: optical fusion.

(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. Synonyms: spinal fusion.

(noun) the act of fusing (or melting) together.