unitization clauseglossary / UNITIZATION CLAUSE unitization clause. Oil & gas. A provision in an oil-and-gas lease granting the lessee the right to unitize the leased premises, generally for enhanced-recovery operations. 词条贡献者 译者Carl,知名法学院保险学专业,擅长翻译各种与保险理赔追索相关的法律文件。