Definition - The art of making predictions based on the letters in a person's name.

Example -
I predict that Bob will float.

Etymology -
The word derives from the Greek onoma, name + tekhne, art.

Oxford English Dictionary -
Its first citation is from 1730–6:
"Onomatechny … the Art of Prognosticating from the Letters of a Person's Name."
( Bailey (folio), Preface)

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