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Relating to the orbits.
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or·bit·al 'ȯr-bət-əl n a subdivision of a nuclear shell containing zero, one, or two electrons
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or·bi·tal (orґbĭ-təl) 1. pertaining to the orbit. 2. in an atom, the wave function describing the probability of occurrence of an electron of a particular energy level of an atom or molecule; each orbital can hold two electrons of opposing spin.Medical dictionary. 2011.