What is At Law?

Legal Definition
This phrase is used to point out that a thing is to be done according to the course of the common law; it is distinguished from a proceeding in equity.

2. In many cases when there is no remedy at law, one will be afforded in equity. See 3 Bouv. Inst. n. 2411.
-- Bouviers Law Dictionary
Legal Definition
According to law; by, for or in law; particularly in distinction from that which is done in or according to equity; or in titles such as sergeant at law, barrister at law, attorney or counsellor at law. See Hooker v. Nichola, 116 N. a 157, 21 S. E. 208.
-- Black's Law Dictionary
Legal Definition
Before a court of law, as distinguished from equity or other tribunals.
-- Ballentine's Law Dictionary