The phrase "entire basement" means the complete area or space within the basement. There is no part or section of the basement that is excluded or left out. Full definition
There were stations set up throughout the entire basement using toys and games that we already owned. (realfitrealfoodmom.com)
I had taken over my entire basement with boxes of inventory, my front foyer and my entire dining nook in my kitchen. (theleakyboob.com)
Secretly, I'm pretty excited about the inspiration I've been finding for this because our entire basement is actually covered in saltillo tile (a form of terracotta). (cocokelley.com)