stam ‧ i ‧ na /ˈstæmənə, ˈstæmɪnə/ BrE AmE noun [uncountable]
[ Date: 1700-1800 ; Language: Latin ; Origin: plural of stamen 'thread, thread of life' ; ⇨ ↑ stamen ]
physical or mental strength that lets you continue doing something for a long time without getting tired:
You need stamina to be a long-distance runner.
Elaine has the stamina and the determination to succeed.