Breadcrumb Home > Dictionary Search Cite Meaning of Third Amendment Find definitions for: Third' Amend'ment Pronunciation: [key] an amendment to the U.S. Constitution, ratified in 1791 as part of the Bill of Rights, guaranteeing that the forced quartering of soldiers in private homes would be prohibited in peacetime and allowed only by prescribed law during wartime. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. third third base Related Content Daily Word Quiz: opprobrium Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language