/ Dictionary / Index T transpiration: Meaning and Definition of Find definitions for: tran•spi•ra•tion Pronunciation: (tran"spu-rā'shun), [key] — n. an action or instance of transpiring. the passage of water through a plant from the roots through the vascular system to the atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: transpiration (Thesaurus) transpierce transpire Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language