denitrification

This term is a specialized technical word used primarily in environmental science, microbiology, and agricultural chemistry. It describes a specific stage of the nitrogen cycle where nitrogen is removed from an ecosystem, often viewed as a beneficial process in wastewater treatment to prevent eutrophication, but as a loss of nutrients in farming.

As a technical process name, it is treated as an uncountable noun. It refers to the chemical phenomenon itself rather than individual instances of the reaction. Consequently, it does not take a plural form in standard scientific discourse.