Define the terms :

(i) solute (ii) solvent (iii) solution

(i) Substances which dissolves or disappear in the solvent to form a solution is called a solute.

(ii) Liquid [generally water] or medium of dissolution - which allows the solute to dissolve in it so as to form a solution is called a solvent.

(iii) A homogenous mixture of a solute in a solvent [i.e., a uniform mixture of two or more substances] whose composition may be gradually changed by changing the relative amount of components is called solution.