the act of nitrifying.

1820–30; nitr- + -i- + -fication Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nitrification (ˌnaɪtrɪfɪˈkeɪʃən)
1.  See also nitrogen cycle the oxidation of the ammonium compounds in dead organic material into nitrites and nitrates by soil nitrobacteria, making nitrogen available to plants
2.  a.  the addition of a nitro group to an organic compound
 b.  the substitution of a nitro group for another group in an organic compound

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American Heritage
Medical Dictionary

nitrification ni·tri·fi·ca·tion (nī'trə-fĭ-kā'shən)

  1. The oxidation of an ammonia compound into nitric acid, nitrous acid, or any nitrate or nitrite, especially by the action of bacteria.

  2. The treatment or combination of a substance with nitrogen or compounds containing nitrogen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nitrification   (nī'trə-fĭ-kā'shən)  Pronunciation Key 
The process by which bacteria in soil and water oxidize ammonia and ammonium ions and form nitrites and nitrates. Because the nitrates can be absorbed by more complex organisms, as by the roots of green plants, nitrification is an important step in the nitrogen cycle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
These processes are called nitrification and involve the transfer of nitrogen between microbes in the ocean.
Nitrous oxide is produced naturally in soils through the microbial processes of denitrification and nitrification.
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