/ Dictionary / Index A arithmancy: Meaning and Definition of Find definitions for: ar•ith•man•cy Pronunciation: (ar'ith-man"sē), [key] — n. divination by the use of numbers, esp. by the number of letters in names. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arithmancy (Thesaurus) arith. arithmetic Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language