/ Dictionary / Index T Twenty-sixth Amendment: Meaning and Definition of Find definitions for: Twen'ty-sixth' Amend'ment Pronunciation: [key] an amendment to the U.S. Constitution, ratified in 1971, lowering the voting age to 18. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. twenty-sixth twenty-third Related Content Daily Word Quiz: apogee Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language