Definition of "transpiration" [tran•spi•ra•tion]

• The act or process of transpiring, especially through the stomata of plant tissue or the pores of the skin. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The net effect of reduced transpiration is that plants consume less water – meaning more remains in the soil and can run off into rivers."
• "This order shall be effective in any case in which the travel or transpiration is authorized or approved and commenced on or after September 23, 1950."
• "This process, called transpiration, is similar to the human cooling effect of perspiration."