Origin of prefatory
- From Latin praefātus past participle of praefārī to say before preface
From American Heritage Dictionary of the English Language, 5th Edition
- 1670s, from Medieval Latin *praefator +"Ž -ory (“agent"), from Medieval Latin prefatia (whence preface), for classical Latin praefatio (“a saying beforehand") - see preface for details.
- Note that this is borrowed from Latin, not derived in English from preface, as in occasional misspelling *prefecatory.