The action of trajecting or fact of being trajected; a throwing or carrying across; passage through. Transmission (of light, heat, or other form…

Conveyance or passage through a medium, as of light, heat, sound, etc.; spec. in Radio and Television (see transmit, v. 3b); also, a series of…

Physics. The passage of movement, energy, a vibration, a wave, etc., in a particular direction or through a medium; the progression of a crack…