接続詞

(1)the grammatical relation between linguistic units (words or phrases or clauses) that are connected by a conjunction

(2)接続詞でつながった言語単位（単語、句または節）同士の文法的関係

(3)an uninflected function word that serves to conjoin words or phrases or clauses or sentences

(4)単語、句、節、文を結合する役割をする語尾変化しない機能語