A large building in which aircraft are kept. (Cambridge Dictionary)
A hangar is a large building in which aircraft are kept. (Collins Dictionary)
A shed or shelter. (Dictionary.com)
Any relatively wide structure used for housing airplanes or airships. (Dictionary.com)
A covered and usually enclosed area for housing and repairing aircraft. (Merriam – Webster)
Why is a building you store airplanes in called a hangar?
Aviation Hangar | WBDG – Whole Building Design Guide.
Solar Impulse Airplane – A Mobile Hangar That Protects Solar Impulse 2