Fusion The process of combining two light

Fusion the process of combining two light nuclei to form a heavier, more stable nucleus. (21.6)... 

Nuclear fusion is the process by which two light atomic nuclei combine to form one heavier atomic nucleus. As an example, a proton (the nucleus of a hydrogen atom) and a neutron will, under the proper circumstances, combine to form a deuteron (the nucleus of an atom of heavy hydrogen )- In general, the mass of the heavier product nucleus is less than the total mass of the two lighter nuclei. 

FUSION. In the context of nuclear weapons and nuclear reactors, fusion refers to the process of combining of two light-nuclei atoms into a single heavier nucleus. This process is accompanied by the release of a substantial amount of energy. The light-nuclei atoms typically used in this process are deuterium and tritium. See also GEORGE HYDROGEN BOMB. 

Fusion Process by which two light atoms are combined at extraordinarily high temperatures into a single, heavy nucleus, resulting in the release of much greater amounts of energy than produced by nuclear fission. 

Fusion (meaning to join together) results from the combination of two small nuclei to form a larger nucleus with the concurrent release of large amounts of energy. The best example of a fusion reactor is the sun. Continuous fusion processes furnish our solar system with light and heat. 

---