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Definition of nitrogen fixation noun from the Oxford Advanced Learner's Dictionary

nitrogen fixation

noun
 
/ˈnaɪtrədʒən fɪkseɪʃn/
 
/ˈnaɪtrədʒən fɪkseɪʃn/
[uncountable]
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  1. the chemical process by which nitrogen from the atmosphere is changed by bacteria into compounds in the soil that plants and other living things can use, especially as part of the nitrogen cycleTopics The environmentc2
buttercup
noun
 
 
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Plants and trees
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