A term sometimes ap-plied to one who is obliged to make his own defense when on trial, or in a civil cause. A cause is said to be undefended when the defendant makes default, in not putting in an appearance to the plaintiff’s action; in not putting in his statement of defeuse; or in not appearing at the trial either personally or by counsel, after having received due notice. Mozley & whitley
Source: Black's Law Dictionary 2nd Ed (1910)