aviation aviation /ˌeɪviːˈeɪʃən/

noun

1. () (military) the aggregation of a country's military aircraft  ( air power , aviation )
   (military) the aggregation of a country's military aircraft
   
   
2. Travel via aircraft  ( air , air travel , aviation )
   travel via aircraft
    Air travel involves too much waiting in airports
   air travel involves too much waiting in airports
    If you've time to spare go by air
   if you've time to spare go by air
   
3. The art of operating aircraft  ( airmanship , aviation )
   the art of operating aircraft
   
4. The operation of aircraft to provide transportation  ( aviation )
   the operation of aircraft to provide transportation