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| any of the energy levels of a physical system, such as an atom or molecule, that has higher energy than the lowest energy level |
| a very large colliding-beam machine in which superconducting magnets create millions of megavolts of energy |
| cosmic string | |
| —n | |
| See also string a one-dimensional defect in space-time postulated in certain theories of cosmology to exist in the universe as a consequence of the big bang | |