WordReference Random House Learner's Dictionary of American English © 2026
a•rith•me•tic /n. əˈrɪθmətɪk; adj. ˌærɪθˈmɛtɪk/USA pronunciation   n. [uncountable]
  1. Mathematicsthe method, process, or study of adding, subtracting, multiplying, and dividing numbers.

adj. ar•ith•met•ic 
  1. MathematicsAlso, ˌar•ithˈmet•i•cal. of or relating to the rules of arithmetic:arithmetical computations.
ar•ith•met•i•cal•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2026
a•rith•me•tic  (n. ə rithmə tik;adj. ar′ith metik),USA pronunciation n. 
  1. Mathematicsthe method or process of computation with figures: the most elementary branch of mathematics.
  2. MathematicsAlso called higher arithmetic, theoretical arithmetic. the theory of numbers;
    the study of the divisibility of whole numbers, the remainders after division, etc.
  3. Mathematicsa book on this subject.

adj. ar•ith•met•ic 
  1. MathematicsAlso, ar′ith•meti•cal. of or pertaining to arithmetic.
  • Medieval Latin arismētica, with s for Late Greek th
  • Old French arismetique
  • Greek arithmētiké̄ (téchnē) (art, skill) of numbers, equivalent. to arithmé(ein) to reckon + -t(o)- verbal adjective, adjectival + -iké̄ -ic; replacing Middle English arsmet(r)ike
  • Latin arithmētica, feminine singular of arithmēticus
  • 1200–50
ar′ith•meti•cal•ly, adv. 

'arithmetically' also found in these entries (note: many are not synonyms or translations):

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