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English definition of “lifetime”

lifetime

noun [C usually singular] uk   /ˈlaɪf.taɪm/ us  
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.
(Definition of lifetime from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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