late 14c., from Old French preface "opening part of sung devotions" (14c.) and directly from Medieval Latin prefatia, from Latin praefationem (nominative praefatio) "fore-speaking, introduction," in Medieval Latin "prologue," noun of action from past participle stem of praefari "to say beforehand," from prae "before" (see pre-) + fari "speak," from PIE root *bha- (2) "to speak, tell, say."
1610s, from preface (n.). Related: Prefaced; prefacing.
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