The phrase "to define the space" means to establish or outline the specific area or parameters of something. It refers to making clear and setting boundaries or characteristics for understanding something or a situation. Full definition
To help define the space in a more pleasing way, we added an L - shaped wall near the entrance of the home and with it, created a large storage pantry. (squarefootageinc.com)
Using complementary colours and textures like this will help link defined spaces for a natural flow. (idealhome.co.uk)
The end result is a cloud of points that defines the space of printable clusters. (sciencedaily.com)