Meaning of three-mile limit

three'-mile lim'it

Pronunciation: (thrē'mīl"), [key]
— Internat. Law. Internat. Law.
  1. the limit of the marine belt of three mi. (4.8 km), which is included within the jurisdiction of the state possessing the coast.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.