/ Dictionary / Index T territorialize: Meaning and Definition of Find definitions for: ter•ri•to•ri•al•ize Pronunciation: (ter"i-tôr'ē-u-līz", -tōr'-), [key] — -ized, -iz•ing. to extend by adding new territory. to reduce to the status of a territory. to make territorial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: territorialize (Thesaurus) territoriality territorial waters Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language