Osmosis is best defined as the movement of 6-17-2013 solute molecules across a membrane from an area of low water to an area of higher water concentration. water molecules inside a container. solute molecules across a membrane from an area of high water concentration to an area of lower water concentration. water molecules from an area of high solute concentration to an area of lower solute concentration. water molecules from an area of low solute concentration to an area of higher solute concentration.