What does NASA stand for?

NASA stands for National Aviation and Space Agency

This definition appears somewhat frequently

Other Resources: Acronym Finder has 48 verified definitions for NASA

Samples in periodicals archive:

National Aviation and Space Agency (Lapan) Invites Students to Plant Tomato Seeds from Outer space

By the end of the Space Shuttle program the American National Aviation and Space Agency (NASA) had conducted more than 220 "piggy backmissions" with the SCA 905.