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Denise,毕业于一所旨在培养高级翻译专业人才的翻译院校,专注翻译各类与专利与商标的授权与起诉有关的法律文件。