<p><strong>Verb</strong></p><ul><li>to make pure; free from anything that debases, pollutes, adulterates, or contaminates: to purify metals.</li><li>to free from foreign, extraneous, or objectionable elements: to purify a language.</li><li>to free from guilt or evil.</li><li>to clear or purge (usually followed by of or from).</li><li>to make clean for ceremonial or ritual use.</li></ul><p><strong>Noun</strong></p><ul><li>a slight variation or difference of color, character, etc.</li><li>the act of a person or thing that shades.</li><li>the representation of the different values of color or light and dark in a painting or drawing.</li></ul>