Definition - The forming of anagrams, i.e. words created by reordering another word's letters.

Example -
Changing the word not into ton is an act of anagrammatism.

Etymology -
The word derives from the French anagrammatisme, which ultimately derives from the Greek anagrammatizein, to transpose letters (from the Greek ana, up or back + gramma, letter).

Oxford English Dictionary -
Its first citation is from 1657:
"Names consisting of alphabetary revolution, which they will have to be anagrammatism."
(Camden Rem. (1657) 169)

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