Definitionen
1.NounThe atmosphere of the Earth and the region of space around it.
2.NounThe industry concerned with aircraft, missiles, satellites and spacecraft."He works mainly in aerospace. Most of their contracts are in aerospace. A few are in medical devices."
3.AdjectiveOf, or relating to the Earth's atmosphere and nearby space.
4.AdjectiveOf, or relating to the science, technology and industry associated with aircraft, missiles, satellites and spacecraft.