/ Dictionary / Index P port authority: Meaning and Definition of Find definitions for: port' author"ity Pronunciation: [key] a government commission that manages bridges, tunnels, airports, and other such facilities of a port or city. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Port-au-Prince Port Blair Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language