名詞 prolegomenon:

1. a preliminary discussion inserted at the beginning of a book or treatise

pro.le.gom.e.non

n.（名詞）
【復(fù)數(shù)】 pro.le.gom.e.na[-n…]
A preliminary discussion, especially a formal essay introducing a work of considerable length or complexity.
引言，緒論：正文前的討論，尤指用正式的文章介紹很長(zhǎng)或很復(fù)雜的著作
prolegomena (used with a sing. or pl. verb)Prefatory remarks or observations.
prolegomena （與單數(shù)或復(fù)數(shù)動(dòng)詞連用）開場(chǎng)白：引言性的言論或評(píng)論

來源：
Greek [from neuter of present passive participle of] prolegein [to say beforehand]
希臘語(yǔ) [] 源自prolegein的被動(dòng)時(shí)態(tài)現(xiàn)在分詞的中性詞 [預(yù)先說]
pro- [before] * see pro- 2
pro- [在…之前] *參見 pro-2
legein [to speak] * see leg-
legein [說] *參見 leg-

【引伸】
pro.legom.enous
adj.（形容詞）