Concentration: the measure of how much of a given substance there is mixed with another substance.

w/v: Mass-volume percentage, describes the mass of the solute in g per 100 ml of the resulting solution.

v/v: Volume-volume percentage, describes the volume of the solute in ml per 100 ml of the resulting solution.

Molarity: (mol/L, molar, or M) or molar concentration denotes the number of moles of a given substance per liter of solution.