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variation :
1. BIOLOGY. The difference of an animal or plant from a normal or standard type. Variation results from the fact that each living thing has its own unique genetic makeup. This is important in the evolution of a species, because variation assures a range of characteristics, some of which may be better adapted for survival that others in a changing environment. 2. ASTRONOMY. The deviation of a celestial body, such as a planet or a comet, from its average orbit or motion.
