noun
- the longest period over which the life of any organism or species may extend, according to the available biological knowledge concerning it.
- the longevity of an individual.
noun
- the period of time during which a human being, animal, machine, etc, may be expected to live or function under normal conditions
n.
- A lifetime.
- The average or maximum length of time an organism, a material, or an object can be expected to survive or last.