n. 1 transference of heat in a gas or liquid by upward movement of the heated and less dense medium. 2 Meteorol. the transfer of heat by the upward flow of hot air or downward flow of cold air. convection current circulation that results from convection. convectional adj. convective adj.
[ LL convectio f. L convehere convect- (as COM-, vehere vect- carry) ]