Webster's English Dictionary

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mathematics

math.e.mat.ics \.math-*-'mat-iks\ n pl but sing in constr  1: the science 
   of numbers and their operations, interrelations, combination s, 
   generalizations, and abstractions and of space configurations and their 
   structure, measurement, transformations, and generalizations 2: a branch 
   of, operation in, or use of mathematics {~ of physical  chemistry}