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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 |
| the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth |
attraction at·trac·tion (ə-trāk'shən)
n.
A force acting mutually between particles of matter to draw them together and to resist their separation.