conjunction

柯林斯詞典

1. N-COUNT A conjunction of two or more things is the occurrence of them at the same time or place. 同時(shí)發(fā)生; 同地發(fā)生[正式]
...the conjunction of two events. …兩事件的同時(shí)發(fā)生。
2. N-COUNT In grammar, a conjunction is a word or group of words that joins together words, groups, or clauses. In English, there are coordinating conjunctions such as "and" and "but," and subordinating conjunctions such as "although," "because," and "when." 連詞
3. PHRASE If one thing is done in conjunction with another, the two things are done or used together. 與…一起 (做、用)[usu PHR 'with' n]
Textbooks are designed to be used in conjunction with classroom teaching. 教科書(shū)被設(shè)計(jì)成與課堂教學(xué)配合使用。

The conjunction "although " joins the two clauses in the sentence "He left , although I begged him not to."
When you write a series of nouns or adjectives , such as 'purple , green and blue ', you use a conjunction before the last one, instead of a comma .