Initialism of naval air station.
"The nas are currently analyzing the data from all the northern regions."
plural of NA
In plain English: Nas is an American rapper known for his smooth voice and clever lyrics about life, love, and success.
"The nas was blocked by dust, making it hard for her to breathe properly."
Initialism of National Academy of Sciences. (US)
"The prestigious members of NAS gather annually to discuss advancements in science and engineering."