She has the 'sole' authority to hire new staff members. [=only she can hire new staff members]
The 'sole' aim/objective/purpose of the program is to help the poor.
Icy roads were the 'sole' cause of the accident.
(..) who can't count to ? I imagined a mountain of swords too high to climb. So many fallen enemies, you could only see the soles of Aegon's feet. I saw them executing Lannister prisoners in the street. They said they were acting on your orders. (..)2019 TvShow: Game of Thrones Title: The Iron Throne Season: 8 Episode 6