Meaning of “lifetime” in the English Dictionary

british dictionary

"lifetime" in British English

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lifetimenoun [ C usually singular ]

uk /ˈlaɪf.taɪm/ us /ˈlaɪf.taɪm/

B2 the period of time during which someone lives or something exists:

We'll see a tremendous lot of technological changes during/in our lifetime.
Winners of the competition will receive the holiday of a lifetime (= the best holiday they will ever have).
I've only been working here two days, but it seems like a lifetime.
A watch of this quality should last a lifetime.
Enter our competition and this once-in-a-lifetime experience could be yours!
Marriage is no longer always seen as a lifetime commitment.
You could win a lifetime's supply of toothpaste.

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(Definition of “lifetime” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"lifetime" in American English

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lifetimenoun [ U ]

us /ˈlɑɪfˌtɑɪm/

the period of time during which someone lives or something exists:

The watch is high quality and should last a lifetime.

(Definition of “lifetime” from the Cambridge Academic Content Dictionary © Cambridge University Press)