GNU Collaborative International Dictionary of English

Found one definition

1.       
   Convection (?), n. [L. convectio, fr. convehere to bring together; con- + vehere to carry.]
   1. The act or process of conveying or transmitting.
   
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   2. (Physics) 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.
   
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   Liquids are generally heated by convection -- when heat is applied from below. Nichol.
   
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