"Of, relating to, or characteristic of a preacher or preaching; involving or derived from preaching", Early 17th cent.; earliest use found in Thomas Coryate (?1577–1617), traveller and writer. From post-classical Latin praedicatorius laudatory, of or relating to preaching from classical Latin praedicātor + -ius, suffix forming adjectives; compare -ory.[predicatory etymology, predicatory origin, 英语词源]