extension agreementglossary / EXTENSION AGREEMENT extension agreement. An agreement providing additional time for the basic agreement to be performed. [Cases: Contracts 242. C.J.S. Contracts § 407.] 词条贡献者 法律翻译玉晶,毕业于英国一流的高级翻译学院,专注翻译各类与通用数据保护条例有关的法律文件。