denitrification
noun
de·ni·tri·fi·ca·tion
(ˌ)dē-ˌnī-trə-fə-ˈkā-shən
: the loss or removal of nitrogen or nitrogen compounds
specifically
: reduction of nitrates or nitrites commonly by bacteria (as in soil) that usually results in the escape of nitrogen into the air
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Merriam-Webster unabridged
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