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HOME >> BIOLOGY >> DICTIONARY. In modern architecture, an atrium (plural atria) is a large open space, often several stories high and having a glazed roof and/or large windows, often situated within an office building and usually located immediately beyond... Atrium (architecture), a large open space within a building.
Definition of biology. 1  1 : a branch of knowledge that deals with living organisms and vital processes advances in the field of biology a biology textbook. 2  2a : the plant and animal life of a region or environment the biology of the rain forestb : the life processes especially of an organism or group the biology of cancer cells; broadly : ecology.