The pressure that must be exerted onto a solution in order to prevent water from diffusing into that solution through a semipermeable membrane is called pressure.

The answer in the space provided is osmotic pressure because this is a type of pressure that is used in solvents that are pure in which is use to prevent it from having to pass to solutions in which is also described in the given statement above, it is exerted to prevent the water from diffusing to another solution.