Denitrogenation refers to the removal of nitrogen from a substance. There are several synonyms for this term such as nitrogen removal, reduction of nitrogen, and depletion of nitrogen. Other terms that can be used to describe this process are nitrogen depletion, nitrogen stripping, and nitrogen elimination. Additionally, denitrogenation can be achieved through various methods including reverse osmosis, thermal treatment, and biological processes. These synonyms can be useful when discussing the removal of nitrogen from different substances such as water, soil, or air, and can be helpful in scientific research and technical discussions.