broadcast , v : (transitive) To transmit a message or signal through radio waves or electronic means. (transitive) To transmit a message over a wide area; specifically, to send an email in a single transmission to a (typically large) number of people. (intransitive) To appear as a performer, presenter, or speaker in a broadcast programme. (transitive, agriculture, horticulture, archaic) To sow seeds over a wide area.