aviation/ˌeɪviˈeɪʃən/1航空the aggregation of a country's military aircraft同义词： air power2航空travel via aircraft同义词： air travelair3航空the art of operating aircraft同义词： airmanship4航空the process of flying an aircraft5航空, 航空学the study of the design, development, and operation of aircrafts, focusing on principles of aerodynamics, propulsion, and material science