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From The Collaborative International Dictionary of English v.0.48:
Unsaturated \Un*sat"u*ra`ted\, a. 1. Capable of absorbing or dissolving to a greater degree; as, an unsaturated solution. [1913 Webster] 2. (Chem.) Capable of taking up, or of uniting with, certain other elements or compounds, without the elimination of any side product; thus, aldehyde, ethylene, and ammonia are unsaturated; benzene has three unsaturated bonds. The term is applied most commonly to compounds with a double or triple bond between two carbon atoms (as in ethylene). [1913 Webster +PJC]