Arithmancy

Webster's Practical Dictionary- A Practical Dictionary of the Englih Language · 1884 · p. 34

ar'ith-man'si or a-rith^man-sf, n. The foretelling of future events, by means of numbers. — Arithmetic, n. Science of numbers; art of computation by figures. — Arithmetical, a. According to, etc. —Arithmetically, a-lv. — Ar'ithmeti'cian, -tish'an, n. One skilled in, etc.