| ability or strength to last or endure; endurance; stamina. |

| stay·ing power (stā'ĭng) n. The ability to endure or last. |
staying power
The ability to endure or last, as in I'm not sure that this young novelist will have staying power, or Our candidate definitely has staying power. This expression comes from racing, where it means "the strength to maintain speed through a race." [Second half of 1800s]