Black's Law Dictionary, Sixth Edition, p. 1045

Nihil Dicit.  He says nothing.  The name of the judgment which may be taken as of course against a defendant who omits to plead or answer the plaintiff's declaration or complaint within the time limited.  In some jurisdictions it is otherwise known as judgment "for want of a plea". 

Judgment taken against party who withdraws his answer is judgment nihil dicit, which amounts to confession of cause of action stated, and carries with it, more strongly than judgment by default, admission of justice of plaintiff's case.  See also Nil dicit judgment

[Black's Law Dictionary, Sixth Edition, p. 1045]