purity

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pur·i·ty

(pyūr'i-tē),
The state of being pure, free from contaminants or pollutants.
[L. puritas, fr. purus, clean, undefiled]

purity

NIHspeak The relative absence of extraneous matter in a drug or vaccine that may or may not be harmful to the recipient or deleterious to the product

saturation 

Attribute of a visual sensation, which permits a judgment to be made of the proportion of pure chromatic colour in the total sensation. Note: This attribute is the psychosensorial correlate, or nearly so, of the colorimetric quantity purity (CIE).

pur·i·ty

(pyūri-tē)
The state of being pure, free from contaminants or pollutants.
[L. puritas, fr. purus, clean, undefiled]