Stamina/ˈstæmɪnə/ Definition 1 of 3Pro Tip 1/3Long-Term Activity Stamina involves activities that last a long time, not short bursts of energy. She has the stamina to work double shifts. Pro Tip 2/3Physical Exertion Often associated with physical tasks where endurance is key, like sports. The boxer's stamina was evident in the late rounds. Pro Tip 3/3Incremental Improvement Stamina can be developed over time through regular practice or training. Her daily jogs improved her stamina.