biology
US /baɪˈɑː.lə.dʒi/
UK /baɪˈɑː.lə.dʒi/

1.
the scientific study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy
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She is studying biology at university.
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The course covers various aspects of human biology.
2.
the characteristic life processes or phenomena of a group or category of living organisms
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The biology of marine mammals is fascinating.
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Understanding the biology of the virus is crucial for developing a vaccine.