Plain English Meaning
A recorded weather and route briefing that pilots could listen to through certain navigation radios in the cockpit, giving them weather and flight information for the route they were flying.
Full Definition
A continuously recorded aviation weather and route forecast broadcast over selected low-frequency (L/MF) and VOR navigation facilities, providing pilots with weather conditions, forecasts, winds aloft, and notices to airmen along specific route segments. TWEB service has been largely discontinued in the contiguous but may still be referenced in older training materials and in some Alaskan operations.