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Related to correlative conjunction: subordinating conjunction
Correlative conjunctions, or paired conjunctions, are sets of conjunctions that are always used together. Like coordinating conjunctions, they join words, phrases, or independent clauses of similar or equal importance and structure. Unlike coordinating conjunctions, they can only join two elements together, no more.
Either of a pair of conjunctions, such as either ... or or both ... and, that connect two parts of a sentence and are not used adjacent to each other. The second of the pair is always a coordinating conjunction.