/ Dictionary / Index T tonnage deck: Meaning and Definition of Find definitions for: ton'nage deck" Pronunciation: [key] — Naut. Naut. the upper deck in a vessel with only two decks. the second deck above the inner bottom in a vessel with more than two decks. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tonnage tonne 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