verb (used with object), purified, purifying.
to make pure; free from anything that debases, pollutes, adulterates, or contaminates: to purify metals.
to free from foreign, extraneous, or objectionable elements: to purify a language.
to free from guilt or evil.
to clear or purge (usually followed by of or from ).
to make clean for ceremonial or ritual use.
verb (used without object), purified, purifying.
to become pure.

1250–1300; Middle English purifien < Middle French purifier < Latin pūrificāre. See pure, -ify

purification, noun
purificatory [pyoo-rif-i-kuh-tawr-ee, -tohr-ee] , adjective
purifier, noun
nonpurification, noun
nonpurifying, adjective
repurification, noun
repurify, verb, repurified, repurifying.
self-purifying, adjective
unpurified, adjective
unpurifying, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
purify (ˈpjʊərɪˌfaɪ)
vb , -fies, -fying, -fied
1.  to free (something) of extraneous, contaminating, or debasing matter
2.  (tr) to free (a person, etc) from sin or guilt
3.  (tr) to make clean, as in a ritual, esp the churching of women after childbirth
[C14: from Old French purifier, from Late Latin pūrificāre to cleanse, from pūrus pure + facere to make]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, "free from spiritual pollution," from O.Fr. purifier (12c.), from L. purificare "to make pure," from purus "pure" (see pure) + root of facere "to make" (see factitious). Meaning "free from extraneous matter" is recorded from c.1440.
Purification first attested c.1380; in ref. to Feast of the Purification of the Virgin Mary, from 1389.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

Purify definition

A debugging tool from Pure Software.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
New aerogels could clean contaminated water, purify hydrogen for fuel cells.
The intense internal heat generated by his sort of yoga was meant to purify and
  cleanse the body.
The final stage in the process is to wash and spin the red cells to purify them.
It takes him about half an hour to purify a tank's worth of fuel in this way.
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