broadcast

The word is exactly what it looks like: broad plus cast. In Old English, to broadcast was to scatter seed widely across plowed ground, flinging handfuls in sweeping arcs. Every farmer in medieval England knew the motion. You reached into your sack, grabbed a fistful, and cast it broad across the furrows. The word appeared in agricultural texts by the 1700s as a standard term for this ancient planting method.

Radio changed everything. When the Westinghouse engineer Frank Conrad began transmitting music from his Pittsburgh garage in 1920, nobody had a word for what he was doing. He was scattering signals, not seeds, but the metaphor was exact. Station KDKA, which launched that November, adopted 'broadcasting' to describe the transmission of radio waves to a wide, unseen audience. The agricultural word fit because the physics matched: signals radiated outward from a central point, landing wherever a receiver happened to be.

The BBC, founded in 1922, made the word official in its very name: the British Broadcasting Corporation. Within a decade, broadcast had shed its farming skin almost entirely. Television adopted it in the 1930s. By the time CBS and NBC dominated American living rooms in the 1950s, almost no one remembered the fields where the word was born.

The shift from seed to signal is one of the cleanest metaphorical transfers in English. A farmer cannot choose which patch of soil receives a particular seed. A radio tower cannot choose which receiver picks up its signal. In both cases, the sender releases something into the open and hopes it lands well. The act of trust is identical.