arithmancy

[ ar-ith-man-see ]
/ ˈær ɪθˌmæn si /

noun

divination by the use of numbers, especially by the number of letters in names.

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Also a·rith·mo·man·cy [uh-rith-muh-man-see, ar-ith-]. /əˈrɪθ məˌmæn si, ˈær ɪθ-/.

Origin of arithmancy

First recorded in 1570–80; from New Latin arithmomantia, from Greek arithmó(s) “number, a number” + manteía -mancy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020