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Inversion. The conversion of a compound whose solution rotates plane-polarized (q.v.) light either left or right in a polarimeter (q.v.) into one that reverses the direction of the rotation. Thus, sucrose (q.v.), which is dextrorotatory (right-turning), yields on inversion, or hydrolysis (q.v.), a levorotatory (left-turning) mixture of dextrose (q.v.) and fructose (q.v.).