Persistence; determination (8)
I believe the answer is:
tenacity
I believe this is a double definition.
'persistence' is the first definition.
(I know that persistence can be written as tenacity)
'determination' is the second definition.
(I know that tenacity is a type of determination)
(Other definitions for tenacity that I've seen before include "Perseverance, doggedness" , "Firmness of hold" , "Doggedly pursuing" , "Persistence in holding on" , "Staying power" .)