preface - definition and synonyms

verb [transitive] formal 

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/ˈprefəs/
present tense
I/you/we/theypreface
he/she/itprefaces
present participleprefacing
past tenseprefaced
past participleprefaced
  1. to say, do, or write something before you say, do, or write the most important part

    He prefaced his speech with a quotation from Faulkner.