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Osmosis Definition In biology, osmosis is defined as the net movement of water molecules through a biological membrane (e.g. cell membrane) from an area of higher to an area of lower water potential. Other definitions of osmosis are as follows: The net spontaneous flow of solvent molecules into the solution or from more dilute solution to more concentrated solution through a semipermeable membrane is called osmosis . Osmosis is the spontaneous movement of solvent molecules , typically water, through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration, aiming to equalize solute concentrations on both sides. By definition , osmosis is the movement of any solvent through a selectively permeable membrane into an area of higher solute concentration, the result of which will be an equalizing of solute concentration on either side of the membrane.