"boot aperture" refers to the opening or entrance of the trunk of a car. It is the point where you can put in or take out items from the storage space located at the back of the vehicle. Full definition
The boot is 29 litres larger at 370 litres (with a larger boot aperture) and there's more stowage in the centre console - though we'd expect this to vary depending on whether the buyer opts for a manual or automatic transmission. (evo.co.uk)
It's helped by a large, well - shaped boot aperture and a loading lip that's just 590 mm off the ground. (autoexpress.co.uk)
A lower load height (by 10 cm) and bigger boot aperture make the Kona easier to live with. (motoring.com.au)