survival
noun [ U ]
uk/səˈvaɪvəl/ usthe state of continuing to exist, and not to fail or be destroyed:
His main concern is to ensure his own political survival.
The survival of the company in such difficult economic times is very uncertain.
survival of the fittest
the idea that only the strongest can succeed:
Unfettered competition has led to survival of the fittest, with a few large companies reaping huge profits while small companies have been driven out of business.