aerial

The Greek word aēr originally meant something more specific than air: it was the lower atmosphere, the hazy misty layer close to the earth, distinct from the pure aithēr of the heavens above. Homer uses it in the Iliad to describe the obscuring mist that gods drape over heroes they want to hide from enemies. From aēr came the adjectival form aérios (of or in the air), which passed into Latin as aerius and eventually reached English as aerial. The word arrived carrying the old Greek sense of something suspended, belonging to neither earth nor heaven.

Aerial entered English around 1604, appearing in astronomical and poetic writing to describe things of or belonging to the air. John Milton used it in Paradise Lost in 1667 for the angelic choir singing in aerial flight. At this stage aerial was purely an adjective, a synonym for airy or atmospheric that carried a slightly elevated register. It appeared in scientific discussions of the properties of air and in verse about soaring birds and the movements of heavenly bodies.

The transformation from adjective to noun happened in the 1890s during the early experiments in wireless telegraphy. Guglielmo Marconi and British engineers needed elevated wires to send and receive radio signals, and they began calling these wires aerial wires and then simply aerials by the end of the decade. The word was a natural choice: these were wires that lived in the air. The Oxford English Dictionary records the first noun use in 1902.

American English preferred antenna for the same device, borrowed from the Latin word for the yard-arm of a sailing ship, which had already been applied to insect feelers before it landed on the radio wire. The British aerial and the American antenna diverged in the early 20th century and have never fully converged. Aerial in British English now covers television roof antennas, radio masts, and any elevated receiver, while in American usage the original adjective sense persists in aerial photography and aerial acrobatics.