连词（ conjunction）又称连接词，是用来连接词语、短语、句子、段落等的词，表示被连接的语言单位之间的关系。连词在句子中表逹不同的逻缉关系。连接词和词组的连词，跟连接句子的连词并不相同。

In grammar, a conjunction (abbreviated CONJ or CNJ) is a part of speech that connects words, sentences, phrases, or clauses. A discourse connective is a conjunction joining sentences. This definition may overlap with that of other parts of speech, so what constitutes a "conjunction" must be defined for each language. In general, a conjunction is an invariable grammatical particle, and it may or may not stand between the items in a conjunction.