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SATURA'TION, noun In a general sense, a filling or supply to fullness. In chimistry, the union, combination or impregnation of one body with another by natural attraction, affinity or mixture, till the receiving body can contain no more; or solution continued till the solvent can contain no more. The saturation of an alkali by an acid, is by affinity; the saturation of water by salt, is by solution.