avi·a·tion 
/ˌeɪviˈeɪʃən/ noun
/ˌeɪviˈeɪʃən/ noun [noncount] : the business or practice of flying airplanes, helicopters, etc.
▪ an expert in aviation ▪ commercial/military aviation — often used before another noun ▪ an aviation expert ▪ the aviation industry
▪ an expert in aviation ▪ commercial/military aviation — often used before another noun ▪ an aviation expert ▪ the aviation industry
