- Of or pertaining to aviation We've seen a lot of growth in the aero sector.
- 1918, Illustrated World (volume 29, issue 3, page 406) According to aero experts these planes will be capable of carrying six passengers, five machine guns, a special rapid fire aerogun and about fifty bombs, and will be practically immune from injury due to attacks by the light battleplanes …
- Aerodynamic, or having an aerodynamic appearance It's a very aero design, with smooth lines.
- (slang, uncountable, auto racing) Aerodynamics
- (informal, countable, dated) An airplane or airship.