Osmosis is the diffusion of a solution of a weaker concentration” into a solution of stronger concentration when – both are seperated by a semi-permeable membrane.” What is the error in the above statement?

Diffusion: Movement of molecules from high to low concentration; both solute and solvent move.
 Osmosis: Movement of solvent across a semipermeable membrane from high to low solvent concentration; only solvent moves.

✅Explanation:
Osmosis is defined as the tendency of a fluid, usually water to pass through a semipermeable membrane into a solution where the solvent concentration is low and the solute concentration is higher. 
Here it is given that “Osmosis is the diffusion of a solution of a weaker concentration” into a solution of stronger concentration when – both are separated by a semi-permeable membrane.” in this statement, the solvent movement is not specified, since osmosis involves movement of solvent only.