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“nomancy”
Divination by the letters of a name: Onomancy is known to assess the number of vowels in a name, or to interpret the sum of the numerical value of the letters.
This entry is located in the following units:
-mancy, -mancer, -mantic, -mantical
(page 10)
nom-, nomen-, nomin-, -nomia, -nomic
(page 3)