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1590s, from Medieval Latin anathematizationem (nominative anathematizatio), noun of action from past participle stem of anathematizare (see anathematize). Earlier was anathemization (1540s).
"to pronounce an anathema against," 1560s, from French anathématiser (Old French anatemer), from Latin anathematizare, from Greek anathematizein "to devote (to evil)," from stem of anathema. Alternative anathemize (1670s) is less correct and more rare. Related: Anathematized; anathematizing.