Definition of wireless telegraphy in US English:

wireless telegraphy

noun

historical
  • Telegraphy in which the signal is transmitted by radio waves rather than over wires.

Origin

Late 19th century; earliest use found in Saturday Evening Telegraph (Alton, Illinois). From wireless + telegraphy.

Pronunciation

wireless telegraphy

/ˌwʌɪələs tɪˈlɛɡrəfi/