enduring strength and energy
"After hours of hiking through the dense forest, she was finally rewarded with a breathtaking view thanks to her incredible stamina."
The energy and strength for continuing to do something over a long period of time; power of sustained exertion, or resistance to hardship, illness etc.
"The botanist carefully counted the stamina of each flower to determine its reproductive capacity."
plural of stamen
The word stamina comes from the Latin stāmina, which is the plural form of stāmen. Originally, it referred to threads or strands.