Etymology
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transpiration (n.)

early 15c., from Medieval Latin transpirationem (nominative transpiratio), noun of action from past participle stem of transpirare (see transpire).

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Definitions of transpiration

transpiration (n.)
the passage of gases through fine tubes because of differences in pressure or temperature;
transpiration (n.)
the process of giving off or exhaling water vapor through the skin or mucous membranes;
transpiration (n.)
the emission of water vapor from the leaves of plants;
From wordnet.princeton.edu