/ Dictionary / Index H high sea: Meaning and Definition of Find definitions for: high' sea' Pronunciation: [key] the sea or ocean beyond the three-mile limit or territorial waters of a country. Usually, the open, unenclosed waters of any sea or ocean; common highway. Law.the area within which transactions are subject to court of admiralty jurisdiction. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. high school high sign Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language