Pronunciation: (rOO'ling), [key]
1. an authoritative decision, as one by a judge on a debated point of law.
2. the act of drawing straight lines with a ruler.
3. ruled lines.
1. governing or dominating: the ruling party.
2. controlling; predominating: the ruling factor in recovery from an illness.
3. widespread; prevalent: ruling prices; ruling values.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.