/ Dictionary / Index T tonn.: Meaning and Definition of Find definitions for: tonn. Pronunciation: [key] tonnage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ton-mile tonnage Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language