evapotranspiration Syllabification: (e·vap·o·tran·spi·ra·tion)Pronunciation: /iˌvapōˌtranspəˈrāSHən/Definition of evapotranspiration noun the process by which water is transferred from the land to the atmosphere by evaporation from the soil and other surfaces and by transpiration from plants. evapotranspiration in other Oxford dictionaries Definition of evapotranspiration in the British & World English dictionary