nitrogen fixation is a noun meaning "the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria". It carries one recorded sense.
the assimilation of atmospheric nitrogen by soil bacteria and its release for plant use on the death of the bacteria
Definitions, synonyms and semantic relations for nitrogen fixation come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.