/ Dictionary / Index T third party procedure: Meaning and Definition of Find definitions for: third' par"ty proce'dure Pronunciation: [key] — Law. Law. impleader. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. third-party insurance third-party software Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language