1) v. to decide a legal question, by a court, as in: "I rule that the plaintiff is entitled to the goods and damages for delay in the sum of $10,000." 2) v. to make a judicial command, such as: "I find that George Gonzo is the parent of Larry Gonzo and rule that he must pay support of $150 per month to the mother" for the support of Larry. 3) n. any regulation governing conduct. 4) n. one of the regulations of covering legal practice before a particular group of courts, collectively called "rules of court" adopted by local judges. 5) n. a legal principle set by the decision in an appellate case, as "the rule in the case of Murray v. Crampton is…."