This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of preface.

v. Third-person singular simple present indicative form of preface.

"The items that failed to pass contain prefaces for the Mass for various occasions; votive Masses and Masses for the dead; solemn blessings for the end of Mass; prayers over the people and eucharistic prayers for particular occasions, such as for evangelization or holy orders."

postscript    follow   

prefaced    prefaces    prefacing   

introduction   

foreword    prelude    introduction   

prefatory   

prefaced    prefacing   

prologue    prelude    preamble    preliminary    introduction   

memoir    epistle    essay    dissertation    pamphlet