形容詞 prefatory:

1. serving as an introduction or preface
   同義詞：introductory, prefatorial

pref.a.to.ry

adj.Abbr. pref.（形容詞）縮寫 pref.
Of, relating to, or constituting a preface; introductory.See Synonyms at preliminary
序言的，開場白的：序言的、與序言有關(guān)的或組成序言的；開場白的參見 preliminary

來源：
From Latin praef3tus [past participle of] praef3ro [to say before] * see preface
源自 拉丁語 praef3tus [] praef3ro的過去分詞 [先于…說] *參見 preface

【引伸】
pref.ato.rily
adv.（副詞）