āviāˈtion noun

1. The art or practice of mechanical flight
2. The production, design, operation, etc of aircraft
3. The aircraft industry
4. (usu military) aircraft collectively (US)

āˈviātor noun

A pilot who flies aircraft, an airman or airwoman

āˈviatress or aviatrix /ā-vi-āˈtriks/ noun

A female pilot

aviation spirit noun

A motor fuel with a low initial boiling point and complying with a certain specification, for use in aeroplanes