n. The act of guiding, directing, or leading; guidance.n. The act of training up.n. Transmission; conveyance; specifically, in physics, transmission of heat from points of high temperature to points of low temperature, or of electricity from points of high potential to points of low potential, from particle to particle, and to a distance, by the raising of the temperature or potential of intermediate particles, without any sensible motion of them.n. In physiology, the transfer of nervous influence along a nerve-fiber or of the contractile force from point to point in muscle-tissue.