matter biology definition
Definition of matter for English Language Learners. : 1  something that is being done, talked about, or thought about. 2  matters : the situation or subject that is being discussed or dealt with. 3  physics : the thing that forms physical objects and occupies space.
Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, evolution, distribution, and taxonomy. Modern biology is a vast and eclectic field, composed of many branches and subdisciplines.