n 1 a  :  something gained or added <the most common form of leukocytosis is that in which the 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 : esp  :  the amount of positive or negative change in the value of one or more of a set of variables in*cre*men*tal adj in*cre*men*tal*ly adv 
 
   
 
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