Medical Definition of increment
1a: something gained or added <the most common form of leukocytosis is that in which the increment is in the neutrophilic leukocytes—W. A. D. Anderson>b: one of a series of regular consecutive additions (as of growth or spread of disease)
2: the amount or degree by which something changes; especially : the amount of positive or negative change in the value of one or more of a set of variables
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