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epidemiology. the science concerned with the study of the factors determining and influencing the frequency and distribution of disease, injury, and other health-related events and their causes in a defined human population for the purpose of establishing programs to prevent and control their development and spread.
Medical Definition of epidemiology. plural. epidemiologies. 1: a branch of medical science that deals with the incidence, distribution, and control of disease in a population. 2: the sum of the factors controlling the presence or absence of a disease or pathogen.