This is the 3599th most frequent Russian word.
собственное
"Собственное" means "own" or "personal."
The word 'собственное' is used to emphasize individuality and uniqueness of the opinion.
У каждого есть своё собственное мнение.
Everyone has their own opinion.
Here, 'собственное' is applied to highlight the personal importance of the space.
Она старалась сохранить своё собственное пространство.
She tried to preserve her own space.
In this sentence, 'собственное' refers to the ownership and uniqueness of the solution being developed.