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Wiktionary
compound sentence

n. (context grammar English) a sentence that has two or more independent clauses, joined by a conjunction (such as 'but', 'and') and/or punctuation (such as ',').

WordNet
compound sentence

n. a sentence composed of at least two coordinate independent clauses

Usage examples of "compound sentence".

It was rare that he could complete a compound sentence, or after a particularly stupefying weekend, a simple one.