Solution: A homogeneous mixture of two or more substances, where the solute is evenly distributed throughout the solvent.

Solute: The substance that is being dissolved in a solution.

Solvent: The substance that dissolves the solute in a solution.

Unsaturated solution: A solution in which more solute can be dissolved at a given temperature and pressure.

Saturated solution: A solution in which no more solute can be dissolved at a given temperature and pressure.

Supersaturated solution: A solution that contains more solute than it would normally dissolve at a given temperature and pressure.

Solubility: The maximum amount of solute that can dissolve in a given amount of solvent at a given temperature and pressure.

Concentration: The amount of solute present in a given amount of solution.

Molarity: The number of moles of solute per liter of solution.

Dilution: The process of adding solvent to a solution to decrease its concentration.

Solvation: The process of surrounding solute particles with solvent particles to form a solution.

Solubility curve: A graph that shows the relationship between solubility and temperature for a particular solute-solvent combination.