lifetime
/ˈlaɪfˌtaɪm/
Noun
lifetimeSingular
lifetimesPlural
1
The duration of time that a person lives or a thing exists or functions.
She achieved many goals in her lifetime.
2
The period during which something is functional, valid, or effective.
The lifetime of this battery is about five years.
Adjective
lifetimeCanonical form
1
Lasting or continuing for the duration of a person's life.
He received a lifetime achievement award for his work.
2
Of exceptional importance or rarity; once in a lifetime.
This is a lifetime opportunity that you shouldn't miss.