1sole 
/ˈsoʊl/ adjective
always used before a noun /ˈsoʊl/ adjective 1 : only or single
▪ He became the sole heir to the property. ▪ the sole owner ▪ The sole aim/objective/purpose of the program is to help the poor. ▪ She was the sole survivor of the tragedy. ▪ Icy roads were the sole cause of the accident. 2 : belonging only to the person or group specified
▪ She has the sole authority to hire new staff members. [=only she can hire new staff members] ▪ He has sole jurisdiction of the area.
▪ He became the sole heir to the property. ▪ the sole owner ▪ The sole aim/objective/purpose of the program is to help the poor. ▪ She was the sole survivor of the tragedy. ▪ Icy roads were the sole cause of the accident.
▪ She has the sole authority to hire new staff members. [=only she can hire new staff members] ▪ He has sole jurisdiction of the area.
