plural of parent-in-law

One's spouse's parent.

The body of law concerning international trade on the high seas.

(nonstandard) plural of sister-in-law

Set of rules generally regarded and accepted as binding in relations between states and between nations, serving as a framework for the practice of stable and organized international relations.

The task of ensuring obedience to the law. / The various government agencies, regarded collectively, involved in the prevention of crime and the apprehension of criminals.

(idiomatic) The survival of the fittest, strongest, or most cunning

Used other than figuratively or idiomatically: see against, the, law. / (law) Illegal; forbidden by law.

plural of civil law

A stepfather of one's spouse.