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From The Collaborative International Dictionary of English v.0.48:
Gradate \Gra"date\, v. t. [See Grade.] 1. To grade or arrange (parts in a whole, colors in painting, etc.), so that they shall harmonize. [1913 Webster] 2. (Chem.) To bring to a certain strength or grade of concentration; as, to gradate a saline solution. [1913 Webster]