Con*vec"tion (?), n. [L. convectio, fr. convehere to bring together; con- + vehere to carry.]
The act or process of conveying or transmitting.
A process of transfer or transmission, as of heat or electricity, by means of currents in liquids or gases, resulting from changes of temperature and other causes.
Liquids are generally heated by convection -- when heat is applied from bellow.
© Webster 1913.