n (uncountable) The body of rules and standards issued by a government, or to be applied by courts and similar authorities.
n (context|more generally) A written or understood rule that concerns behaviours and the appropriate consequences thereof. Laws are usually associated with mores.
n (scientific|strictly) A well-established, observed physical characteristic or behavior of nature. The word is used to simply identify "what happens," without implying any explanatory mechanism or causation. Compare to theory.
n A category of English "common law" petitions that request monetary relief, as opposed to relief in forms other than a monetary judgment; compare to "equity".
n (fantasy) One of the two metaphysical forces of the world in some fantasy settings, as opposed to chaos.