The Collaborative International Dictionary of English v.0.48:
airborne \airborne\ adj.
1. conveyed by or through air, as dust or pollen; as, a clean
room is needed to avoid airborne contaminants.
2. in flight; flying; -- said of an airplane.
3. (Mil.) carried directly to the site of battle by aircraft;
-- said of combat troops, as, an airborne division.
WordNet (r) 3.0 (2006):
adj 1: moved or conveyed by or through air