inversion (in-ver's hun). 1

A reversal of the natural order of things; a turning upside down. 2. In digestion, conversion of disaccharids, such as cane sugar and maltose, into mono sac char ids, such as dextrose and levulose. 3. In chemistry, a changing of the volume of polarized light from one direction to the other, as is brought about in hydrolysis of cane sugar by means of an acid or an enzyme. Often specifically applied to hydrolysis of cane sugar to glucose and fructose. 4. In optics, transformation of a body having a specific rotary action on the plane of polarization into a body or bodies which have a directly opposite rotary action. 5. In medicine, partial or complete turning inside out of a hollow organ. 6. In psycho-analysis alack of harmony between the physical and psychical sex. [Lat., in, into, -fvertere, to turn.]