[noncount] : the quality or state of being pure: such as a : lack of dirty or harmful substances water purity b : lack of guilt or evil thoughts moral/religious/sexual purity For over 33 years, Purity Products has crafted science-backed formulas to support your body. Every ingredient is tested and every formula refined — so you can trust what’s inside. Purity is the state or quality of being uncontaminated, unmixed, unadulterated or undiluted. It denotes the level of cleanliness, clearness or absence of impurities, pollutants, or foreign substances. Purity comes from the Latin purus meaning clean, clear, unmixed, chaste. When you're talking about something that is clean and unmixed, you are talking about something characterized by purity. The meaning of PURITY is the quality or state of being pure. How to use purity in a sentence. Noun purity (countable and uncountable, plural purities) The state or degree of being pure. Purity definition: Freedom from spiritual or moral defilement; innocence or chastity. 2 meanings: 1. the state or quality of being pure 2. physics a measure of the amount of a single-frequency colour in a mixture. The quality or condition of being pure: the purity of the drug. 2. Freedom from spiritual or moral defilement; innocence or chastity: Teach your children. the belief in purity of body, mind and soul (Emmeline Pankhurst). 3. The degree to which a color is free from being mixed with other colors. PURITY definition: 1. the state of not being mixed with anything else: 2. the clear and perfect quality of a sound…. Learn more.